Chapter 7, Problem 103E

What solution can you add to each cation mixture to precipitate one cation while keeping the other cation in solution? Write a net ionic equation for the precipitation reaction that occurs.

a. ${\text{Fe}}^{2+}\left(aq\right){\text{ and Pb}}^{2+}\left(aq\right)$

b. ${\text{K}}^{+}\left(aq\right){\text{ and Ca}}^{2+}\left(aq\right)$

c. ${\text{Ag}}^{+}\left(aq\right){\text{ and Ba}}^{2+}\left(aq\right)$

d. ${\text{Cu}}^{2+}\left(aq\right){\text{ and Hg}}_2{}^{2+}\left(aq\right)$