What is the maximum concentration of Ag⁺ that can be added to a 0.00200 M solution of Na₂CO₃ before a precipitate will form? (Ksp for Ag₂CO₃ is 8.10 × 10⁻¹²)

Answer 1

Common Ion Effect:

CO₃^2-(aq)+ 2Ag⁺(aq) ==> Ag₂CO3(s)

Ag₂CO₃(s) <==> 2Ag⁺(aq) + CO₃^2-(aq)

Ksp = 8.10x10^-12 = [Ag⁺]²[CO₃^2-] = [Ag⁺]²[0.002]

[Ag⁺]² = 4.1x10^-9

[Ag⁺] = 6.4x10^-5 M