Sodium sulfate is slowly added to a solution containing 0.0500 M Ca²+ (aq) and 0.0270 M Ag+ (aq). What will be the concentration

Question

Sodium sulfate is slowly added to a solution containing 0.0500 M Ca²+ (aq) and 0.0270 M Ag+ (aq).
What will be the concentration of Ca2+ (aq) when Ag2SO4 (s) begins to precipitate?
Solubility-product constants, Ksp, can be found in the chempendix.
[Ca²+] =
What percentage of the Ca²+ (aq) can be precipitated from the Ag+ (aq) by selective precipitation?
percentage:

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