Chem 111 Precipitation & Net Ionic Equations Name:______

Chem 111 Precipitation & Net Ionic Equations Name:______

<p> Chem 111 Precipitation & Net Ionic Equations Name:______</p><p>Chapters 17 – Net Ionic Equations Today’s exercise involves prediction, observation, and drawing conclusions about the solubility chemistry of ionic compounds. 1. Teams of 4 students will spend 20 minutes guessing possible outcomes of reactions #1-5. 2. I will demonstrate each reaction (#1-#5) on the overhead projector. Record your observations. 3. Team up again and write reactions for #6 – 12. Spend 10 minutes doing this, then I’ll demonstrate them. 4. Your team will answer the questions on the last pages. Hints:  The precipitation equations should represent a “double-displacement precipitation” reaction (cations trade anions with each other). Write each one as if you know it will happen. We’ll cross the ones that didn’t go out later.  Note that all reactant solutions represent soluble compounds!  Be sure to write the phase on every chemical.  If no precipitate is formed when we do the demonstration, scratch out the precipitation equation that you wrote.</p><p>Probably # Soln. #1 Soln. #2 Predicted Precipitation Equation Precip? Observations Soluble?</p><p>+ - + - Ag (aq) + NO3 (aq) + Na (aq) + Cl (aq)  + - AgCl (s) + Na (aq) + NO3 (aq) (TOTAL)</p><p>+ - + - 0 AgNO3 (aq) NaCl (aq) Ag (aq) + NO3 (aq) + Na (aq) + Cl (aq)  + - AgCl (s) + Na (aq) + NO3 (aq) Ag+(aq) + Cl- (aq)  AgCl (s) (NET) Probably # Soln. #1 Soln. #2 Predicted Precipitation Equation Precip? Observations Soluble?</p><p>1 AgNO3 (aq) NaI (aq)</p><p>Na SO 2 AgNO (aq) 2 4 3 (aq)</p><p>3 Pb(NO3)2 NaCl (aq)</p><p>4 Pb(NO3)2 NaI (aq)</p><p>Na SO 5 Pb(NO ) 2 4 3 2 (aq)</p><p>NaOH 6 NaNO3 (aq) (aq) Probably # Soln. #1 Soln. #2 Predicted Precipitation Equation Precip? Observations Soluble?</p><p>NaOH 7 Mg(NO3)2 (aq) (aq)</p><p>NaOH 8 Ni(NO3)2 (aq) (aq)</p><p>NaOH 9 Cr(NO3)3 (aq) (aq)</p><p>NaOH 10 Zn(NO3)2 (aq) (aq)</p><p>NaOH 11 AgNO3 (aq) (aq)</p><p>NaOH 12 Pb(NO3)2 (aq) (aq) Questions 1. Circle the cations that were always soluble? (never precipitated) Na+ Mg2+ Ni2+ Cr3+ Zn2+ Ag+ Pb2+ 2. Based on your answer to #1, use periodic trends to predict the solubility of: a. alkali metal ions</p><p> b. alkaline earth metal ions</p><p>(there’s no way we’d tackle the transition metals!) 3. Circle the anions that were always soluble.</p><p>- 2- - - - NO3 SO4 OH Cl I 4. Circle the anions that were seldom soluble.</p><p>- 2- - - - NO3 SO4 OH Cl I 5. Based on your answer to #3& 4, use periodic trends to predict the solubility of halogens ions.</p><p>- + - 6. Nitrate (NO3 ) is always soluble (all of its compounds), so is NH4 and CH3COO as well as the alkali metals (hint to #1). Halogens seem to be mostly insoluble. </p><p>If you have to predict solubility, which rule is more important? Why?</p><p>7. Does your answer to #6 explain all of the following chemical species?</p><p>AgCl AgI PbCl PbI NaCl Pb(NO3)2 AgNO3</p><p>3- 2- 2- 8. Go back to your list of insoluble (seldom soluble) compounds, add PO4 , CO3 , and S . 9. Predict if each of the following will be soluble. (Verbally discuss the why, pointing to solubility rules. Then put a check mark in the Why? box. Species Soluble? Why? Species? Soluble? Why?</p><p>KCl Pb(CH3COO)2</p><p>KNO3 CrPO4</p><p>Ca(OH)2 CaS</p>

View Full Text

Details

  • File Type
    pdf
  • Upload Time
    -
  • Content Languages
    English
  • Upload User
    Anonymous/Not logged-in
  • File Pages
    5 Page
  • File Size
    -

Download

Channel Download Status
Express Download Enable

Copyright

We respect the copyrights and intellectual property rights of all users. All uploaded documents are either original works of the uploader or authorized works of the rightful owners.

  • Not to be reproduced or distributed without explicit permission.
  • Not used for commercial purposes outside of approved use cases.
  • Not used to infringe on the rights of the original creators.
  • If you believe any content infringes your copyright, please contact us immediately.

Support

For help with questions, suggestions, or problems, please contact us