Question

Silver chloride is only slightly soluble in pure water at 25∘C:AgCl(s)⇌Ag+(aq)+Cl−(aq)K=1.8×10−10Calculate the concentration of Ag+ and Cl− in a solution that is saturated with AgCl (i.e., the system is at equilibrium and there is still solid AgCl visible).

Answer 1

AgCl (s) <----------------> Ag+ (aq) + Cl- (aq)

                                       S               S

Ksp = [Ag+][Cl-]

1.8×10^−10 = S^2

S = 1.34 x 10^-5

concentration of [Ag+] = [Cl-] = 1.34 x 10^-5 M