Question

Solid silver acetate is slowly added to 75.0 mL of a 0.0652 M potassium carbonate solution. The concentration of silver ion required to just initiate precipitation is

M.

Answer 1

Answer – We are given, [K₂CO₃] = 0.0652 M , volume = 75.0 mL

We know Ksp for silver carbonate is 8.10 x 10^-12

We know the Ksp expression for silver carbonate

Ag₂CO₃ (s) -----> 2 Ag⁺(aq) + CO₃^2-(aq)

Ksp = [Ag⁺]² [CO₃^2-]

[K₂CO₃] =[CO₃^2-] = 0.0652 M

8.10 x 10^-12 = [Ag⁺]² x 0.0652

[Ag⁺]² = 8.10 x 10^-12 / 0.0652 M

            = 1.24 x 10^-10

[Ag⁺] = 1.11 x 10^-5 M

The concentration of silver ion required to just initiate precipitation is 1.11 x 10^-5 M