chemistry homework help on solutions?

Question

A chemist is given the job of recovering silver ions, Ag+, from a solution before the solution is discarded.

1. If the solution is AgNO3, what chemical could she add in order to extract the silver from the solution?

A. Cu+
B. NaCl
C. HNO3
D. NaNO3

2. Based on your choice of reactants, what kind of reaction would the chemist use to extract the silver?

A. Addition
B. Double-replacement
C. Decomposition
D. Single-replacement

3. In addition to the silver ions. what other product is formed by the reaction?

A. CuAg
B. AgCl
C. NO3
D. CuNO3


All help is appreciated. I'm doing a test review and I really want to understand the material so I can pass my final.

Answer 1

B
C?
B

AgNO3 + NaCl --> AgCl + Na+No3-

AgCl is a precipitate that drops out as a bright white powder.

Though I guess that wouldn't preserver the Ag ions, but it would separate them from the rest of the solution.

Answer 2

NaCl (item B) will add Cl- to solution. Since AgCl is not very soluble, most of the Ag will precipitate out as the chloride. Since the other ions in solution are Na+NO3-, this is a double replacement reaction.