Silver chromate is dissolved in 0.1M AgNO3. What affect does the common ion have of the solubility?

Question

Ksp= 9×10^-12

 

Molar solubility= 1.3

Answer 1

It should read "what effect" not "what affect".

Common ion will DECREASE the solubility of the AgNO3.  This is based on Le Chatelier's Principle.

AgNO₃(s) <==> Ag⁺(aq) + NO₃^-(aq)

Ksp = [Ag⁺][NO3^-]

As you increase the concentration of either Ag⁺ or NO₃^- (a common ion), the reaction equilibrium is shifted to the left, making the salt LESS soluble.