DOCSLIB.ORG

Carbonate Equilibria

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Carbonate Equilibria Soil Chemistry 5-1 CARBONATE EQUILIBRIA Carbonates are arguably the most important dissolved component of soil solutions and in alkaline soils this statement is even less disputable. Implicit in this statement is the relationship among dissolved carbonate species whether or not they are in equilibrium with solid phase metal carbonates. The simplest example of carbonates is the control which dissolved carbon dioxide has on water pH and buffering. In this section of the course we will consider the effect of carbon dioxide on water pH, the influence of solid phase calcium carbonate on solution composition and the implications of these reactions. Several systems including carbon dioxide, solution and solid phase carbonates can be envisioned. Some of these include (after Garrels and Christ, 1967). 1. The solution pH of water in equilibrium with carbon dioxide and essentially devoid of other controlling species. 2. The reaction of calcium carbonate saturated solutions with free access to carbon dioxide. In essence this is the equilibrium of lime with air or soil air. Also referred to as an open system with solid phase present. This case is of considerable interest as it represents the relationship of dilute natural waters in contact with the atmosphere and system control only by the carbonate equilibria. 3. The reactions of calcium carbonate with water where the gas phase is restricted or negligible. This condition is not common, but in situations were the equilibrium system has little head space and the mixing of air is restricted the attendant pH and slow rate of return to equilibrium is of interest. This is the famous "Turner Effect". Such as system is also referred to as a closed system since mass is not transferred or exchanged with the surroundings. 4. Equilibrium in systems with a fixed quantity of added alkalinity such as the addition of strong base to a system open to the atmosphere. Other cases can be considered, however these serve to illustrate the great utility of being able to understand the equilbrium behavior of carbonate species in soils and sediments. Section 5- Carbonate Chemistry Soil Chemistry 5-2 CASE 1 CO2 - H2O open system Aqueous carbon dioxide reacts to form carbonic acid via the following reaction: CO2 (aq)3 + H2O ® H 2CO H 2CO 3 = 10 -2.8 = 0.00159 CO 2 (aq) The hydration of carbon dioxide is slow to attain equilibrium below pH 8 in pure systems. However, above pH 11, the hydration reaction is relatively rapid as carbon dioxide reacts directly with hydroxide to form bicarbonate. - - CO2 (aq) + OH = HCO3 (1) In biological systems the hydration of carbon dioxide is catalyzed by carbonic anhydrase a Zn-containing * enzyme. Only a small portion of the aqueous carbon dioxide exists as carbonic acid. However, in most H2CO3 (as defined below) is used to represent solution carbonates. * H 2 CO3 = H 2CO3 + CO2(aq) (2) * Where H2CO3 is the total dissolved cabon including aqueous carbon dioxide. Carbonic acid dissociates into bicarbonate and carbonate according to the following equations: + - ( H ) (HCO3 ) o - 6.4 = K H 2CO3 = 10 (3) ( H 2CO3 ) * where H2CO3 = H2CO3 + CO2 (aq) = H2CO3 o -4 Note that K H2CO3 = 2*10 or pK = 3.69 if corrected for CO2(aq) Section 5- Carbonate Chemistry Soil Chemistry 5-3 + 2- ( H ) (CO3 ) o - 10.3 = - = (4) - K HCO 3 10 ( HCO3 ) As for every aqueous reaction the acid base relationship between the proton and hydroxide is an important relationship. + - (H ) ()OH o - 14 = KW = 10 (5) ( H2O ) Starting with the electrical neutrality expression: + -- 2- [ H ] = [ OH ] + [ HCO3 ] + 2 [ CO 3 ] (6) The system is manipulated to collect terms in the variables of interest - hydrogen ion concentration and carbon dioxide partial pressure. Note that the electrical neutrality expression is defined in terms of concentrations (mol/L). Therefore, in order to utilize values from the thermodynamic equilibrium expressions, the conditional equilibrium constants must be used which relate concentrations rather than activities to the ionic distributions at equilibrium. Defining OH - in terms of H + yields: c KW [OH - ] = (7) [ H + ] - Solving for HCO3 gives: c [ ] - KHH 2CO 3 2 CO3 [HCO 3 ] = (8) []H + Finding carbonate via bicarbonate: c - K - [HCO 3 ] 2 - HCO3 [CO 3 ] = []H + (9) Section 5- Carbonate Chemistry Soil Chemistry 5-4 cc [] KH 2CO3 KH- 2 CO 3 - 2 - HCO3 Substituting for HCO33 : [CO ] = (10) [ H + ] 2 + The rewritten electrical neutrality expression in terms of H and H2CO3 is: c c cc æö - [2 3 ] æöK W æöKHH 2CO33 []2CO 3 KKHH 2CO3 HCO CO [ + ] = + + 2 (11) H ç÷++ç÷ç÷+ 2 èø[HH]èø[] èø[ H ] + 2 Rearranging, multiplying by (H ) and substituting kH * PCO2 for H2CO3 yields: + 3 c+c+cc [] - W [ ] - [] HH - 2 - = 0 HKHKHH22CO3HkkPCO2KCO32KPHCO3 CO (12) + 3 +cccc [] - [] w + HH - 2 - = 0 HHK( KHH22CO3kkPCO2) KCO32KPHCO3 CO We are left with a polynomial equation in [H+]. In this formulation the only variables are (H+) and PCO2. If a known and constant value for the partial pressure of carbon dioxide is inserted into the above equation, (H+) can be found by a variety of numerical techniques. Henry's Law Constant for this reaction is strongly influenced by temperature and slightly affected by ionic strength. o Salt Level kH@ 298K Log kK 0.2 M NaCl 0.0328 -1.48 0.5 M NaCl 0.0304 -1.57 1.0 M NaCl 0.0273 -1.56 o Temp K kH @ 0.2 M NaCl Log kH @ 0.2 M NaCl 273 Ko 0.073 -1.13 278 Ko 0.061 -1.21 283 Ko 0.051 -1.29 288 Ko 0.043 -1.36 293 Ko 0.037 -1.47 298 Ko 0.033 -1.48 308 Ko 0.026 -1.58 Section 5- Carbonate Chemistry Soil Chemistry 5-5 Dissolved carbon is distributed among three species H2CO3, HCO3 and CO3 as a function of pH. In soil systems where there may be an external (to the carbonate system) control on pH it would be handy to know the distribution of the carbonate species given pH. This distribution of carbonate species can be derived from the Henderson-Hasslebach relationship knowing pH and pK’s. A slightly different approach is shown next. Assume : CT = the sum of all carbonate species concentration activity coefficients are neglected or equal to one. + 2 + define z as: z = (H ) + (H ) KH2CO3 + KH2CO3 KHCO3 or more generally as: + 2 + z = (H ) + (H ) K1 + K1 K2 where K1 and K2 are the first and second dissociation constants for the acid. then: +2 [ H2CO 3 ][ H ] = (13) CZT - + [HCO3 ][HK ] 1 = (14) CZT []HCOKK 23= 12 (15) CZT Figure 5.1. The distribution of carbonate species as a fraction of total dissolved carbonate in relation to solution pH. 1.00 ) T 0.75 / C 3 2- CO CO3 0.50 H2CO3 - 2-n HCO3 0.25 = ( H n a pK pK 0.00 1 2 2 4 6 8 10 12 14 Solution pH Section 5- Carbonate Chemistry Soil Chemistry 5-6 Figure 5.2. The activity of carbonate species in relation to pH for a carbon dioxide level of 10-3.5 atmospheres. 2 P = 10-3.5 0 co2 - HCO3 -2 o H2CO3 -4 -6 2- CO3 -8 Log activity of carbonate species -10 4 6 8 10 12 pH Section 5- Carbonate Chemistry Soil Chemistry 5-7 Figure 5.3 . The activity of carbonate species in relation to pH for a carbon dioxide level of 1 atmosphere. 2 Pco2 = 1 atm 0 -2 o -4 H2CO3 - HCO3 -6 2- -8 CO3 Log activity of carbonate species -10 4 6 8 10 12 pH Equilibrium Reactions in the CO2-H2O system. Reaction No. Equilibrium Reaction Log Ko o 1. CO2(g) + H2O W H2CO3 - 1.46 o + - 2. H2CO3 W H + HCO3 - 6.36 - + 2- 3. HCO3 W H + CO3 - 10.33 + - 4. CO2(g) + H2O W H + HCO3 - 7.82 + 2- 5. CO2(g) + H2O W 2 H + CO3 - 18.15 Section 5- Carbonate Chemistry Soil Chemistry 5-8 Figure 5.4 Effect of carbon dioxide partial pressure on the solution concentration of carbonate species in the CO2-water system. 0 H CO -2 2 3 -4 H+ -6 - + - HCO3 & H -8 HCO3 - Log C -10 -12 2- CO3 -14 -16 10 8 6 4 2 0 - Log P CO2 ALKALINITY Examination of Figure 5.4 indicates that as the carbon dioxide partial pressure goes to zero, the solution pH approaches 7 and increasing pressures of carbon dioxide cause the system to be acidic. Therefore, in the CO2- water system there is never a net excess of base. The system can neutralize added base, but can not neutralize added acid. Another way of saying the same thing is to state that the system do not contain any alkalinity. Alkalinity is an important concept in solution chemistry and relates to the acid neutralization capacity of solutions. The definition of alkalinity for the CO2-water system is: --2-+ Alkalinity=[OH]+[HCO33]+-2[]COH[] (16) In the CO2 -water system the electrical neutrality condition for the system is: +---2 [H]=[OH]++[]HCO332[]CO (17) Substituting the electrical neutrality equation into the alkalinity definition : Section 5- Carbonate Chemistry Soil Chemistry 5-9 --22---- Alkalinity=[OH]+[HCO3]+2[CO3]-[OH]--[HCO33]2[]CO (18) Therefore, there is no alkalinity in a CO2-water system, unless other sources of base are added. Case 2. CaCO3 -CO2-H2O system Calcium carbonate in water with a fixed partial pressure of carbon dioxide. For the case of a fixed partial pressure of carbon dioxide and calcium carbonate dissolved in the aqueous phase one more equation is need to describe the system.
Load more

Recommended publications
  • Mineral Quantification with Simultaneous Refinement of Ca-Mg Carbonates Non-Stoichiometry by X-Ray Diffraction, Rietveld Method
    Article Mineral Quantification with Simultaneous Refinement of Ca-Mg Carbonates Non-Stoichiometry by X-ray Diffraction, Rietveld Method Hélisson Nascimento dos Santos 1,*, Reiner Neumann 1,2 and Ciro Alexandre Ávila 2 1 CETEM—Centre for Mineral Technology, Division for Technological Characterisation, 22461-908 Rio de Janeiro, Brazil; [email protected] 2 Museu Nacional, Universidade Federal do Rio de Janeiro, 20940-040 Rio de Janeiro, Brazil; [email protected] * Correspondence: [email protected]; Tel.: +51-21-3865-7263 Received: 3. July 2017; Accepted: 4 September 2017; Published: 8 September 2017 Abstract: Quantitative phase analyses of carbonate rocks containing Mg-rich calcite and non- stoichiometric dolomite by the Rietveld method yielded improved results when the substitutions are refined for either minerals. The refinement is constrained by the c-axis of the lattice for both minerals using the formula c = −1.8603 nMg + 17.061 for calcite, where nMg is the molar fraction of Mg replacing Ca, and c = 16.0032 + 0.8632ΔnCa for dolomite, with ΔnCa being the excess Ca in its B site. The one-step procedure was implemented into the Topas software and tested on twenty-two carbonate rock samples from diverse geological settings, considered analogues to petroleum system lithotypes of the pre-evaporite deposits of Southeastern Brazil. The case study spans over a wide range of calcite and dolomite compositions: up to 0.287 apfu Mg in magnesian calcite, and Ca in excess of up to 0.25 apfu in non-stoichiometric dolomite, which are maximum substitutions the formulas support. The method overcomes the limitations for the quantification of minerals by stoichiometry based on whole-rock chemical analysis for complex mineralogy and can be employed for multiple generations of either carbonate.
    [Show full text]
  • Oregon Department of Human Services HEALTH EFFECTS INFORMATION
    Oregon Department of Human Services Office of Environmental Public Health (503) 731-4030 Emergency 800 NE Oregon Street #604 (971) 673-0405 Portland, OR 97232-2162 (971) 673-0457 FAX (971) 673-0372 TTY-Nonvoice TECHNICAL BULLETIN HEALTH EFFECTS INFORMATION Prepared by: Department of Human Services ENVIRONMENTAL TOXICOLOGY SECTION Office of Environmental Public Health OCTOBER, 1998 CALCIUM CARBONATE "lime, limewater” For More Information Contact: Environmental Toxicology Section (971) 673-0440 Drinking Water Section (971) 673-0405 Technical Bulletin - Health Effects Information CALCIUM CARBONATE, "lime, limewater@ Page 2 SYNONYMS: Lime, ground limestone, dolomite, sugar lime, oyster shell, coral shell, marble dust, calcite, whiting, marl dust, putty dust CHEMICAL AND PHYSICAL PROPERTIES: - Molecular Formula: CaCO3 - White solid, crystals or powder, may draw moisture from the air and become damp on exposure - Odorless, chalky, flat, sweetish flavor (Do not confuse with "anhydrous lime" which is a special form of calcium hydroxide, an extremely caustic, dangerous product. Direct contact with it is immediately injurious to skin, eyes, intestinal tract and respiratory system.) WHERE DOES CALCIUM CARBONATE COME FROM? Calcium carbonate can be mined from the earth in solid form or it may be extracted from seawater or other brines by industrial processes. Natural shells, bones and chalk are composed predominantly of calcium carbonate. WHAT ARE THE PRINCIPLE USES OF CALCIUM CARBONATE? Calcium carbonate is an important ingredient of many household products. It is used as a whitening agent in paints, soaps, art products, paper, polishes, putty products and cement. It is used as a filler and whitener in many cosmetic products including mouth washes, creams, pastes, powders and lotions.
    [Show full text]
  • Sedimentary Factories and Ecosystem Change Across the Permian-Triassic Critical Interval (P-Trci) – Insights from the Xiakou Area (South China)
    bioRxiv preprint doi: https://doi.org/10.1101/2020.08.10.244210; this version posted August 10, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. This manuscript has been submitted for publication in Paläontologische Zeitschrift and is currently under review. Subsequent versions of this manuscript may have slightly different content. If accepted, the final version of this manuscript will be available via the ‘Peer‐reviewed Publication DOI’ ’ link on the right hand side of this webpage. Please feel free to contact any of the authors. Your feedback is very welcome bioRxiv preprint doi: https://doi.org/10.1101/2020.08.10.244210; this version posted August 10, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. Sedimentary factories and ecosystem change across the Permian-Triassic Critical Interval (P-TrCI) – insights from the Xiakou area (South China) Yu Pei1*, Jan-Peter Duda1,2, Joachim Reitner1,2 1Department of Geobiology, Geoscience Center, Georg-August-Universität Göttingen, Göttingen, Germany 2‘Origin of Life’ Group, Göttingen Academy of Sciences and Humanities, Göttingen, Germany Abstract The Permian-Triassic mass extinction included a potentially catastrophic decline of biodiversity, but ecosystem change across this event remains poorly characterized.
    [Show full text]
  • Primary-Explosives
    Improvised Primary Explosives © 1998 Dirk Goldmann No part of the added copyrighted parts (except brief passages that a reviewer may quote in a review) may be reproduced in any form unless the reproduced material includes the following two sentences: The copyrighted material may be reproduced without obtaining permission from anyone, provided: (1) all copyrighted material is reproduced full-scale. WARNING! Explosives are danegerous. In most countries it's forbidden to make them. Use your mind. You as an explosives expert should know that. 2 CONTENTS Primary Explosives ACETONE PEROXIDE 4 DDNP/DINOL 6 DOUBLE SALTS 7 HMTD 9 LEAD AZIDE 11 LEAD PICRATE 13 MEKAP 14 MERCURY FULMINATE 15 "MILK BOOSTER" 16 NITROMANNITE 17 SODIUM AZIDE 19 TACC 20 Exotic and Friction Primers LEAD NITROANILATE 22 NITROGEN SULFIDE 24 NITROSOGUANIDINE 25 TETRACENE 27 CHLORATE-FRICTION PRIMERS 28 CHLORATE-TRIMERCURY-ACETYLIDE 29 TRIHYDRAZINE-ZINC (II) NITRATE 29 Fun and Touch Explosives CHLORATE IMPACT EXPLOSIVES 31 COPPER ACETYLIDE 32 DIAMMINESILVER II CHLORATE 33 FULMINATING COPPER 33 FULMINATING GOLD 34 FULMINATING MERCURY 35 FULMINATING SILVER 35 NITROGEN TRICHLORIDE 36 NITROGEN TRIIODIDE 37 SILVER ACETYLIDE 38 SILVER FULMINATE 38 "YELLOW POWDER" 40 Latest Additions 41 End 3 PRIMARY EXPLOSIVES ACETONE PEROXIDE Synonyms: tricycloacetone peroxide, acetontriperoxide, peroxyacetone, acetone hydrogen explosive FORMULA: C9H18O6 VoD: 3570 m/s @ 0.92 g/cc. 5300 m/s @ 1.18 g/cc. EQUIVALENCE: 1 gram = No. 8 cap .75 g. = No. 6 cap SENSITIVITY: Very sensitive to friction, flame and shock; burns violently and can detonate even in small amounts when dry. DRAWBACKS: in 10 days at room temp. 50 % sublimates; it is best made immediately before use.
    [Show full text]
  • Multidisciplinary Design Project Engineering Dictionary Version 0.0.2
    Multidisciplinary Design Project Engineering Dictionary Version 0.0.2 February 15, 2006 . DRAFT Cambridge-MIT Institute Multidisciplinary Design Project This Dictionary/Glossary of Engineering terms has been compiled to compliment the work developed as part of the Multi-disciplinary Design Project (MDP), which is a programme to develop teaching material and kits to aid the running of mechtronics projects in Universities and Schools. The project is being carried out with support from the Cambridge-MIT Institute undergraduate teaching programe. For more information about the project please visit the MDP website at http://www-mdp.eng.cam.ac.uk or contact Dr. Peter Long Prof. Alex Slocum Cambridge University Engineering Department Massachusetts Institute of Technology Trumpington Street, 77 Massachusetts Ave. Cambridge. Cambridge MA 02139-4307 CB2 1PZ. USA e-mail: [email protected] e-mail: [email protected] tel: +44 (0) 1223 332779 tel: +1 617 253 0012 For information about the CMI initiative please see Cambridge-MIT Institute website :- http://www.cambridge-mit.org CMI CMI, University of Cambridge Massachusetts Institute of Technology 10 Miller’s Yard, 77 Massachusetts Ave. Mill Lane, Cambridge MA 02139-4307 Cambridge. CB2 1RQ. USA tel: +44 (0) 1223 327207 tel. +1 617 253 7732 fax: +44 (0) 1223 765891 fax. +1 617 258 8539 . DRAFT 2 CMI-MDP Programme 1 Introduction This dictionary/glossary has not been developed as a definative work but as a useful reference book for engi- neering students to search when looking for the meaning of a word/phrase. It has been compiled from a number of existing glossaries together with a number of local additions.
    [Show full text]
  • Cyanide Remediation: Current and Past Technologies C.A
    CYANIDE REMEDIATION: CURRENT AND PAST TECHNOLOGIES C.A. Young§ and T.S. Jordan, Department of Metallurgical Engineering, Montana Tech, Butte, MT 59701 ABSTRACT Cyanide (CN-) is a toxic species that is found predominantly in industrial effluents generated by metallurgical operations. Cyanide's strong affinity for metals makes it favorable as an agent for metal finishing and treatment and as a lixivant for metal leaching, particularly gold. These technologies are environmentally sound but require safeguards to prevent accidental spills from contaminating soils as well as surface and ground waters. Various methods of cyanide remediation by separation and oxidation are therefore reviewed. Reaction mechanisms are given throughout. The methods are compared in regard to their effectiveness in treating various cyanide species: free cyanide, thiocyanate, weak-acid dissociables and strong-acid dissociables. KEY WORDS cyanide, metal-cyanide complex, thiocyanate, oxidation, separation INTRODUCTION ent on the transport of these heavy metals through their tissues, cyanide is very toxic. Waste waters from industrial operations The mean lethal dose to the human adult is transport many chemicals that have ad- between 50 and 200 mg [2]. U.S. EPA verse effects on the environment. Various standards for drinking and aquatic-biota chemicals leach heavy metals which would waters regarding total cyanide are 200 and otherwise remain immobile. The chemicals 50 ppb, respectively, where total cyanide and heavy metals may be toxic and thus refers to free and metal-complexed cya- cause aquatic and land biota to sicken or nides [3]. According to RCRA, all cyanide species are considered to be acute haz- die. Most waste-water processing tech- ardous materials and have therefore been nologies that are currently available or are designated as P-Class hazardous wastes being developed emphasize the removal of when being disposed of.
    [Show full text]
  • Part 629 – Glossary of Landform and Geologic Terms
    Title 430 – National Soil Survey Handbook Part 629 – Glossary of Landform and Geologic Terms Subpart A – General Information 629.0 Definition and Purpose This glossary provides the NCSS soil survey program, soil scientists, and natural resource specialists with landform, geologic, and related terms and their definitions to— (1) Improve soil landscape description with a standard, single source landform and geologic glossary. (2) Enhance geomorphic content and clarity of soil map unit descriptions by use of accurate, defined terms. (3) Establish consistent geomorphic term usage in soil science and the National Cooperative Soil Survey (NCSS). (4) Provide standard geomorphic definitions for databases and soil survey technical publications. (5) Train soil scientists and related professionals in soils as landscape and geomorphic entities. 629.1 Responsibilities This glossary serves as the official NCSS reference for landform, geologic, and related terms. The staff of the National Soil Survey Center, located in Lincoln, NE, is responsible for maintaining and updating this glossary. Soil Science Division staff and NCSS participants are encouraged to propose additions and changes to the glossary for use in pedon descriptions, soil map unit descriptions, and soil survey publications. The Glossary of Geology (GG, 2005) serves as a major source for many glossary terms. The American Geologic Institute (AGI) granted the USDA Natural Resources Conservation Service (formerly the Soil Conservation Service) permission (in letters dated September 11, 1985, and September 22, 1993) to use existing definitions. Sources of, and modifications to, original definitions are explained immediately below. 629.2 Definitions A. Reference Codes Sources from which definitions were taken, whole or in part, are identified by a code (e.g., GG) following each definition.
    [Show full text]
  • Hydraulics Manual Glossary G - 3
    Glossary G - 1 GLOSSARY OF HIGHWAY-RELATED DRAINAGE TERMS (Reprinted from the 1999 edition of the American Association of State Highway and Transportation Officials Model Drainage Manual) G.1 Introduction This Glossary is divided into three parts: · Introduction, · Glossary, and · References. It is not intended that all the terms in this Glossary be rigorously accurate or complete. Realistically, this is impossible. Depending on the circumstance, a particular term may have several meanings; this can never change. The primary purpose of this Glossary is to define the terms found in the Highway Drainage Guidelines and Model Drainage Manual in a manner that makes them easier to interpret and understand. A lesser purpose is to provide a compendium of terms that will be useful for both the novice as well as the more experienced hydraulics engineer. This Glossary may also help those who are unfamiliar with highway drainage design to become more understanding and appreciative of this complex science as well as facilitate communication between the highway hydraulics engineer and others. Where readily available, the source of a definition has been referenced. For clarity or format purposes, cited definitions may have some additional verbiage contained in double brackets [ ]. Conversely, three “dots” (...) are used to indicate where some parts of a cited definition were eliminated. Also, as might be expected, different sources were found to use different hyphenation and terminology practices for the same words. Insignificant changes in this regard were made to some cited references and elsewhere to gain uniformity for the terms contained in this Glossary: as an example, “groundwater” vice “ground-water” or “ground water,” and “cross section area” vice “cross-sectional area.” Cited definitions were taken primarily from two sources: W.B.
    [Show full text]
  • Epithermal Bicolor Black and White Calcite Spheres from Herja Ore Deposit, Baia Mare Neogene Ore District, Romania-Genetic Considerations
    minerals Review Epithermal Bicolor Black and White Calcite Spheres from Herja Ore Deposit, Baia Mare Neogene Ore District, Romania-Genetic Considerations 1 1, 2 3 4,5 Ioan Mârza ,Călin Gabriel Tămas, * , Romulus Tetean , Alina Andreica , Ioan Denut, and Réka Kovács 1,4 1 Babe¸s-BolyaiUniversity, Faculty of Biology and Geology, Department of Geology, 1, M. Kogălniceanu str., Cluj-Napoca 400084, Romania; [email protected] (I.M.); [email protected] (R.K.) 2 Babe¸s-BolyaiUniversity, Faculty of Physics, 1, M. Kogălniceanu str., Cluj-Napoca 400084, Romania; [email protected] 3 Babe¸s-BolyaiUniversity, Faculty of European Studies, 1, Em. de Martonne, Cluj-Napoca 400090, Romania; [email protected] 4 County Museum of Mineralogy, Bulevardul Traian nr. 8, Baia Mare 430212, Romania; [email protected] 5 Technical University of Cluj-Napoca, North University Centre of Baia Mare, 62A, Dr. Victor Babes, str., Baia Mare 430083, Romania * Correspondence: [email protected] or [email protected]; Tel.: +40-264-405-300 (ext. 5216) Received: 24 April 2019; Accepted: 5 June 2019; Published: 8 June 2019 Abstract: White, black, or white and black calcite spheres were discovered during the 20th century within geodes from several Pb-Zn Au-Ag epithermal vein deposits from the Baia Mare ore district, ± Eastern Carpathians, Romania, with the Herja ore deposit being the maiden occurrence. The black or black and white calcite spheres are systematically accompanied by needle-like sulfosalts which are known by the local miners as “plumosite”. The genesis of epithermal spheres composed partly or entirely of black calcite is considered to be related to the deposition of calcite within voids filled by hydrothermal fluids that contain acicular crystals of sulfosalts, mostly jamesonite in suspension.
    [Show full text]
  • Acids and Bases
    Name Date Class CHAPTER 14 REVIEW Acids and Bases SECTION 1 SHORT ANSWER Answer the following questions in the space provided. 1. Name the following compounds as acids: sulfuric acid a. H2SO4 sulfurous acid b. H2SO3 hydrosulfuric acid c. H2S perchloric acid d. HClO4 hydrocyanic acid e. hydrogen cyanide 2. H2S Which (if any) of the acids mentioned in item 1 are binary acids? 3. Write formulas for the following acids: HNO2 a. nitrous acid HBr b. hydrobromic acid H3PO4 c. phosphoric acid CH3COOH d. acetic acid HClO e. hypochlorous acid 4. Calcium selenate has the formula CaSeO4. H2SeO4 a. What is the formula for selenic acid? H2SeO3 b. What is the formula for selenous acid? 5. Use an activity series to identify two metals that will not generate hydrogen gas when treated with an acid. Choose from Cu, Ag, Au, Pt, Pd, or Hg. 6. Write balanced chemical equations for the following reactions of acids and bases: a. aluminum metal with dilute nitric acid ϩ → ϩ 2Al(s) 6HNO3(aq) 2Al(NO3)3(aq) 3H2(g) b. calcium hydroxide solution with acetic acid ϩ → ϩ Ca(OH)2(aq) 2CH3COOH(aq) Ca(CH3COO)2(aq) 2H2O(l ) MODERN CHEMISTRY ACIDS AND BASES 117 Copyright © by Holt, Rinehart and Winston. All rights reserved. Name Date Class SECTION 1 continued 7. Write net ionic equations that represent the following reactions: a. the ionization of HClO3 in water ϩ → ϩ ϩ Ϫ HClO3(aq) H2O(l ) H3O (aq) ClO3 (aq) b. NH3 functioning as an Arrhenius base ϩ → ϩ ϩ Ϫ NH3(aq) H2O(l ) ← NH4 (aq) OH (aq) 8.
    [Show full text]
  • Combining Sodium Bicarbonate and Lidocaine Injection
    Combining Sodium Bicarbonate and Lidocaine injection Tom Simpleman Consultant Pharmacist the FAWKS company http://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=f9c826a7‐8f19‐4857‐b5be‐11dcafcfc7a9 Referenced information from National Institutes of Health DESCRIPTION: Sodium Bicarbonate Inj., 8.4% USP Neutralizing Additive Solution is a sterile, nonpyrogenic, solution of sodium bicarbonate (NaHCO3) in Water for Injection. It is added to an appropriate local anesthetic as a neutralizing agent immediately prior to administration. The solution contains no bacteriostat, antimicrobial agent or added buffer and is intended only for single-use. pH is adjusted with carbon dioxide. Per the USP monograph for Sodium Bicarbonate Inj., pH is between 7.0 and 8.5. Osmolar concentration is 2 mOsmol/mL (calc.). Sodium bicarbonate, 84 mg is equal to one milliequivalent each of Na+ and HCO3-. Sodium Bicarbonate, USP is chemically designated as NaHC03, a white crystalline powder soluble in water. Sodium bicarbonate in water dissociates to provide sodium (Na+) and bicarbonate (HCO3-) ions. Sodium (Na+) is the principal cation of the extracellular fluid and plays a large part in the therapy of fluid and electrolyte disturbances. Bicarbonate (HCO3-) is a normal constituent of body fluids and the normal plasma level ranges from 24 to 31 mEq/liter. Bicarbonate anion is considered “labile” since at a proper concentration of hydrogen ion (H+) it may be converted to carbonic acid (H2CO3) and thence to its volatile form, carbon dioxide (CO2) excreted by the lung. Normally a ratio of 1:20 (carbonic acid; bicarbonate) is present in the extracellular fluid. In a healthy adult with normal kidney function, practically all the glomerular filtered bicarbonate ion is reabsorbed; less than 1% is excreted in the urine.
    [Show full text]
  • Important Prescribing Information
    Important Prescribing Information Subject: Temporary importation of 8.4% Sodium Bicarbonate Injection to address drug shortage issues June 14, 2019 Dear Healthcare Professional, Due to the current critical shortage of Sodium Bicarbonate Injection, USP in the United States (US) market, Athenex Pharmaceutical Division, LLC (Athenex) is coordinating with the U.S. Food and Drug Administration (FDA) to increase the availability of Sodium Bicarbonate Injection. Athenex has initiated temporary importation of another manufacturer’s 8.4% Sodium Bicarbonate Injection (1 mEq/mL) into the U.S. market. This product is manufactured and marketed in Australia by Phebra Pty Ltd (Phebra). At this time, no other entity except Athenex Pharmaceutical Division, LLC is authorized by the FDA to import or distribute Phebra’s 8.4% Sodium Bicarbonate Injection, (1 mEq/mL), 10 mL vials, in the United States. FDA has not approved Phebra’s 8.4% Sodium Bicarbonate Injection but does not object to its importation into the United States. Effective immediately, and during this temporary period, Athenex will offer the following presentation of Sodium Bicarbonate Injection: Sodium Bicarbonate Injection, 8.4% (1mEq/mL), 10mL per vial, 10 vials per carton Ingredients: sodium bicarbonate, water for injection, disodium edetate and sodium hydroxide (pH adjustment) Marketing Authorization Number in Australia is: 131067 Phebra’s Sodium Bicarbonate Injection contains the same active ingredient, Sodium Bicarbonate, in the same strength and concentration, 8.4% (1 mEq/mL) as the U.S. registered Sodium Bicarbonate Injection, USP by Pfizer’s subsidiary, Hospira. However, it is important to note that Phebra’s Sodium Bicarbonate Injection (1 mEq/mL), is provided only in a Single Use 10 mL vials, whereas Hospira’s product is provided in 50 mL single-dose vials and syringes.
    [Show full text]