5-Ten Test Tube Mystery

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5-Ten Test Tube Mystery

  1. 1. Experiment 5 Ten Test Tube Mystery
  2. 2. Precipitation <ul><li>Formation of one or more solid precipitates from the combination of aqueous substances. </li></ul><ul><li>Identify ten solutions based on their reactions and properties </li></ul>
  3. 3. Precipitation Reaction <ul><li>Molecular equation </li></ul><ul><li>Pb(NO 3 ) 2 (aq) + 2NaCl(aq)  PbCl 2 (s) + 2NaNO 3 (aq) </li></ul><ul><li>Ionic reaction </li></ul><ul><li>Pb 2+ (aq) + 2NO 3 - (aq) + 2Na + (aq) + 2Cl - (aq)  </li></ul><ul><li>2NO 3 - (aq) + 2Na + (aq) + PbCl 2 (s) </li></ul><ul><li>Net Ionic reaction </li></ul><ul><li>Pb 2+ (aq) + 2Cl - (aq)  PbCl 2 (s) </li></ul>
  4. 4. Procedure <ul><li>Be systematic in testing each combination of solutions. </li></ul><ul><li>Keep solutions and data organized. </li></ul><ul><li>Review data when complete to see if any tests need to be repeated before you leave the lab. </li></ul><ul><ul><li>Students will not be able to come back into lab for re-tests. </li></ul></ul><ul><ul><li>Students must complete worksheet based on their own data. </li></ul></ul>
  5. 5. Experiment Tips <ul><li>Wash well plates before starting the experiment </li></ul><ul><li>Use q-tips with soap and water, RINSE WELL! </li></ul><ul><li>Waste should be poured in the waste carboy in hood </li></ul><ul><ul><li>Use a small amount of water to rinse well plate into the waste container </li></ul></ul><ul><ul><li>Close the carboy after each use </li></ul></ul>
  6. 6. Experiment Tips <ul><li>Odor might be hard to detect in the small wells. </li></ul><ul><li>If you suspect that the reaction caused the release of an odor, repeat the reaction in a test tube using 1mL of each solution. </li></ul><ul><li>Remember to use your hand and waft the odor to your nose. Do not put your nose close to smell the odor. </li></ul>
  7. 7. Hints for the Experiment <ul><li>Make your data table in your notebook before the lab session. </li></ul><ul><ul><li>See the table in your lab book as a guide </li></ul></ul><ul><li>DO NOT WRITE DATA ON TABLE ON PAGE 66 or 71 </li></ul><ul><ul><li>Write your data in your lab notebook. </li></ul></ul><ul><ul><li>The table on page 71 is your final copy to be submitted with the worksheet (i.e. make it neat) </li></ul></ul>
  8. 8. Worksheet <ul><li>Identify each of the solutions </li></ul><ul><li>Use the solubility rules in appendix G to support the identification when possible. </li></ul><ul><ul><li>Learn the solubility rules </li></ul></ul><ul><li>Indicate phases when writing reactions. </li></ul>
  9. 9. Worksheet <ul><li>You need to give at least TWO DIFFERENT pieces of supporting evidence to support your identification. </li></ul><ul><ul><li>One reason must be a net ionic equation. </li></ul></ul><ul><li>Evidence should be based on YOUR results </li></ul><ul><ul><li>Solubility rules </li></ul></ul><ul><ul><li>Hints in lab manual </li></ul></ul><ul><ul><li>Results of your tests </li></ul></ul><ul><li>Results of all tests should be in your lab notebook </li></ul>
  10. 10. What NOT to do: <ul><li>NaBr reacts with AgNO 3 to make a yellowish precipitate </li></ul><ul><li>Br ¯ (aq) + Ag + (aq)  AgBr(s) </li></ul><ul><li>Both 1 and 2 are the SAME REASON, just worded differently </li></ul>
  11. 11. What TO DO: <ul><li>NaBr does not react with CuSO 4 to form a precipitate </li></ul><ul><li>Br ¯ (aq) + Ag + (aq)  AgBr(s) </li></ul><ul><li>Both are two different reasons why you came to the conclusion </li></ul>

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