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NTHS Chemistry Labs Quarter 3 Percent Water in a Hydrate Pre-Lab

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NTHS Chemistry Labs Quarter 3 Percent Water in a Hydrate Pre-Lab NTHS Chemistry Labs Quarter 3 Percent Water in a Hydrate Pre-Lab & Procedure 1 2 Name: ________________________________________________________ Date: ___________________ Chemistry Lab Mr. Zamojski Q3 – Percent Water in a Hydrate PRE-LAB ASSIGNMENT Required Safety Data Sheets (SDS): 1) Copper (II) Sulfate, Pentahydrate 2) Copper (II) Sulfate, Anhydrous Required Pre-Lab Video: ZamJ713 channel on YouTube: “Quarter 3 Chemistry Lab – Percent Water in a Hydrate” QUESTIONS: Refer to the information from the pre-lab video to answer the questions below. 1) The process you will execute in this lab is similar to ___________________________, which a separation process that exploits differences in ___________________________ between substances. Hydrates 2) A hydrate is an _______________compound that has __________________ as part of its crystal structure. 3) Is a molecule of water SYMMETRICAL or ASYMMETRICAL? ____________________________ 4) Is a molecule of water NONPOLAR or POLAR? ____________________________ 5) Label the + (positive) and – (negative) sides of the water molecule. Then indicate whether each circle next to the water molecule represents a + (positive) ion or a – (negative) ion. 3 6) A ___________________ is a continuous array of __________________ and __________________ ions 7) In a hydrate the water molecules are ________________________ within the ionic lattice due to strong electrostatic ____________________________. 8) To remove water from a hydrate, temperatures higher than the ___________________________________ of water are needed. 9) An ___________________________ compound has all the ______________ removed from its ionic lattice. Lab Equipment 10) What are the three materials that will be used for heating? i) _____________________________________________ ii) ____________________________________________ iii) ___________________________________________ 11) What is the name of the porcelain bowl you will use that is designed to withstand high temperatures? ______________________________ 12) What is the name of the triangular holder for your porcelain bowl? ______________________________ Lab Safety Refer to the SDS for Copper(II) Sulfate, Pentahydrate. 7) Refer to Section 2 – Hazards Identification. a) This chemical is ________________ if swallowed. Do not __________, ____________, or smoke when using this product. b) This chemical causes ____________ and serious __________ irritation. 8) Refer to Section 9 – Physical and Chemical Properties a) What color is this chemical? _______________ 9) Refer to Section 11 – Toxicological Information a) What are the acute effects of exposure to this chemical? 4 i) __________________________ ii) ___________________________________________________ iii) __________________________________________________ Refer to the SDS for Copper(II) Sulfate, Anhydrous. 10) Refer to Section 2 – Hazards Identification. a) This chemical is ________________ if swallowed. Do not __________, ____________, or smoke when using this product. b) This chemical causes ____________ and serious __________ irritation. 11) Refer to Section 9 – Physical and Chemical Properties a) What color is this chemical? _______________ 12) Refer to Section 11 – Toxicological Information a) What are the acute effects of exposure to this chemical? i) __________________________ ii) ___________________________________________________ iii) __________________________________________________ 13) What will you wear throughout this laboratory activity to protect yourself from these chemical hazards? ______________________________________ AND _______________________________________ 14) The goal of this lab is to find the mass of ____________________ in the hydrate. Doing the Lab 15) For your first procedure step you will measure the mass of an __________________________________. 16) Next you will measure out ______ to _______ grams of copper(II) sulfate, pentahydrate. Heating the Sample 17) What two precautions should you take before lighting the Bunsen burner? i) _____________________________________________________________________________ ii) ____________________________________________________________________________ 5 18) Next you will first place your ________________________________________ on the iron ring and then place your _____________________ on top of that. a) Make sure that your pipeclay triangle is _________________ enough to prevent the crucible from __________________________________ 19) What is the proper order for lighting a Bunsen burner? _________________ FIRST THEN _______________ a) After lighting your Bunsen burner make sure you have a _________________, ________________________________________ flame b) If you need to adjust the height of iron ring, I) FIRST _______________________________________________________________ II) THEN ________________________________________________________________ 20) Now you should wait and safely ________________________ the sample while it is heating. 21) Next place the crucible cover on the crucible using ________________________. 22) Next transfer the crucible and cover to a ____________________________ using __________________. After Cooling 23) Now measure the mass of your ____________________ and ______________________________ sample. 24) For your last step you will add _______________ to the ______________________ sample in the crucible. Mass Calculations 25) How will you calculate the mass of the anhydrous sample? Mass of Anhydrous Sample = _______________________________________–_________________________ 26) How will you calculate the mass of water in the original sample? Mass of Water = ____________________________________ –______________________________________ 6 Name: _____________________________________________________ Date: _________________ Partner(s): ____________________________________ Chemistry Lab Mr. Zamojski Q3 – Percent Water in a Hydrate LAB PROCEDURE Purpose: The purpose of this activity is to observe and measure the changes in the hydrated ionic compound copper(II) sulfate, pentahydrate (CuSO4•5H2O) as it changes from hydrous to anhydrous and to determine the percent composition of water in the hydrated ionic compound. LAB GRADE Your grade for this lab will be based on the following criteria: • Using the proper safety equipment (goggles & disposable gloves) • Following procedures and staying on task at your lab station • Following safe practices and properly handling accidents • Cleaning up your lab station • Completing the lab report Materials: goggles Bunsen burner tongs disposable gloves ring stand scoopula iron ring crucible & cover copper(II) sulfate, pentahydrate (CuSO4•5H2O) lighter pipette digital scale wire mesh pipeclay triangle water tongs ** Handle the crucible and cover with great care. They have a high tolerance for heat, but they are very BRITTLE and will crack easily** Procedure: 1) Put on goggles and disposable gloves. 2) Place the crucible on the digital scale and record its mass in the DATA TABLE. 3) Press the TARE or ZERO button. The digital reading should now indicate “0.0 g”. 4) Using a scoopula carefully add between 3.0 g and 4.0 g of CuSO4•5H2O to the crucible. Record the mass in the DATA TABLE. 5) Record any observations you make about the CuSO4•5H2O in the DATA TABLE. 6) Set up your ring stand, iron ring, and Bunsen burner. Lock in the metal ring so that it is about 10. cm above the top of your Bunsen burner. 7) Place the pipeclay triangle on the iron ring. Then place your crucible with CuSO4•5H2O on the pipeclay triangle. 8) Light your Bunsen burner by igniting your lighter or match FIRST and then turning on the gas. a. Make sure that you have a blue, non-luminous flame before continuing. 7 9) Adjust the height of your iron ring, so that the tip of the inner blue flame it just below the crucible. Then slide your Bunser burner under the crucible. 10) Heat the contents of the crucible. Record any observations you make in the DATA TABLE. a. Do NOT look directly into the crucible. 11) Once your sample in the crucible has completely changed color, then place the crucible cover on top of the crucible using tongs and wait for 2 more minutes. 12) After 2 minutes have passed, turn off your Bunsen burner. 13) Using tongs place the cover and the crucible on top of a wire mesh. Wait for 5 minutes for the crucible to cool. Make observations about the sample in the DATA TABLE 14) After 5 minutes using tongs transfer the crucible to the digital scale. Record the mass of the crucible and sample in the DATA TABLE. 15) Using tongs place the crucible on the lab table. 16) Using a pipette drip water into the sample inside the crucible. Record your observations in the DATA TABLE. Clean Up: a. Do not touch anything hot with your hands. Leave all hot materials out to cool. b. Return all materials you used to their original location in the lab. c. Clean off your lab station using a sponge, soap, and water. Dry your lab station with paper towels. d. Wash your hands with soap and water. DATA TABLE: Observations Original Sample During Heating After Heating After Adding Water Measurements Mass of empty crucible Mass of hydrous copper (II) sulfate Mass of crucible & anhydrous copper (II) sulfate Calculate the Mass of anhydrous copper (II) sulfate Calculate the Mass of Water Removed 8 Chemistry Laboratory Write-up Checklist Your lab write-up is due by FRIDAY, APRIL 13, 2018. Experiment: Percent Water in a Hydrate Name _______ Safety, 1. Used goggles Procedures, 2. Followed procedures and stayed on task & Cleanup 3. Followed safe practices (5 points)
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