Pre-lab Questions

1. Look up solubility rules. In the lab we will be using NaCl, AgNO₃, BaCl₂, and

K₂CrO₄. Which of these do you expect to be soluble in water?

2. In question 1 we take about four different solutions. If we mix different

combinations of these solutions together, which ones do you expect to react

and not react based on solubility rules?

3. When copper is mixed with concentrated nitric acid copper ion is formed and

NO₂ gas is also formed. Write the balanced Red-Ox reaction for this process,

which is in acidic media.

4. What is the purpose of “wafting” as a technique in the laboratory?

5. If an acid is tested with red litmus paper, what will happen? If an acid is tested

with blue litmus paper, what will happen?

Post-Lab Questions

1. Make sure all the balanced reactions that occurred during the lab are recorded

in the laboratory notebook.

2. Write all the reactions as net-ionic equations and identify any spectator ions.

3. If someone gave you a liquid that they thought could be a solution of NaCl,

HCl, or NaOH, how could you determine which one of the three is in the bottle.

Include as many tests as possible to help confirm your results.

4. If someone gave you a liquid that they thought could be a solution of NaNO₃,

NaCl, Cu(NO₃)_2, CuCl_2, or Sr(NO₃)_2, how could you determine which one of the

four ions is in the solution? Include as many tests as possible to help confirm

your results. Can you think of any other tests you could perform based on

solubility rules?

41