Write net ionic equations for the formation of each of the precipitates observed.

Express your answer as chemical equations separated by a comma. Identify all of the phases in your answer

A solution contains one or more of the following ions: Ag+, Sr+, and Cu2+. When you add sodium chloride to the solution, no precipitate forms. When you add sodium sulfate to the solution, a white precipitate forms. You filter off the precipitate and add sodium carbonate to the remaining solution, producing another precipitate.