What concentration of SO2−3 is in equilibrium with Ag2SO3(s) and 6.50×10−3 M Ag+?

Question

The solubility expression is 𝐾sp=[Ag+]2[SO2−3]

Plug in  and the given [Ag+] value, then solve for [SO2-3].

The Ksp value for Ag2SO3 is 1.50×10-14.

[SO2−3]=____M

Answer 1

Ag₂SO₃(s) <==> 2Ag⁺(aq) + SO₃^2-(aq)

Ksp = [Ag⁺]²[SO₃^2-]

1.5x10^-14 = [6.5x10^-3]²[SO₃^2-] = 4.23x10^-5 (SO₃^2-)

[SO₃^2-] = 3.6x10^-10 M