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Ksp MgF2 = [Mg²⁺][F⁻]²
3,7 x 10⁻⁸ = [10⁻²][s]²
3,7 x 10⁻⁶ = s²
s = √(3,7 x10)⁻⁶
s=(√3,7) x 10⁻³
*Ksp MgF2 = 3,7 x 10^-8
*[MgCl2] = 0,01 M
*Kelarutan MgF2 ?
Ion senamanya adalah Mg2+ dalam MgF2 dan MgCl2, maka [Mg2+] = [MgCl2] = 0,01 M. Sehingga:
MgF2 ⇔ Mg2+ + 2F-
Ksp = [Mg2+] [F-]^2
3,7 x 10^-8 = [0,01] [F-]^2
[F-] = √3,7 x 10^-6
= 0,001923 mol/L