Reactions Between Ions in Aqueous Solutions PURPOSE_______________________________________________________________________ To provide opportunities to develop hypotheses; test those hypotheses and analyze resulting data. To practice use of solubility rules. To practice writing net ionic equations. MATERIALS_____________________________________________________________________ Three sets of six solutions in pipettes A 24-well plate PRELAB QUESTIONS______________________________________________________________ Look at the names of compounds in one of the three sets below. Using solubility rules, page 410, table 11-1, predict the combinations within that set that should provide an insoluble product, a precipitate (ppt.). Write a Complete Balanced Equation for all the combinations. PROCEDURE____________________________________________________________________ Design a method in your notebook for testing your hypotheses (predictions) giving as much detail as possible. Perform the steps of your method making observation as you do so. Set 1 Set 2 Set 3 Nickel II chloride Barium nitrate Iron III chloride Sodium sulfate Potassium chromate Sodium hydroxide Barium hydroxide Aluminum chloride Barium nitrate Sodium carbonate Sodium carbonate Sodium phosphate ANALYSIS AND CONCLUSION Answer the following questions using your observations/data table: 1. Were all of your predictions correct? If not, why not? 2. Did all ppt’s form immediately or did some take time to form? Which ones? 3. What do all the colored ppt’s have in common? 4. Why do you suppose many of the starting compounds contained group I metal ions with a normally insoluble anion? 5. In each case where a ppt. occurred identify the spectator ions present. 6. Write a net ionic equation for the formation of each ppt. If the same ppt. occurs more than once, you only have to write one net equation.
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