Perhatikan harga kelarutan senyawa berikut ini. L(OH)2 = 2 x 10-4 Mn(OH)2 = 3,5 x 10-5 X(OH)3 = 1,7 x 10-6 AgNO3 = 1,6 x 10-9 CaCO3 = 3 x 10-5 Jika ditinjau dar

L(OH)2 => L2+ + 2OH-
s ~ s ~ 2s
Ksp = s x (2s)^2 = 4s^3
2 x 10^-4 = 4s^3
s = 9,75 x 10^-2

Mn(OH)2 => mn2+ + 2OH-
s ~ s ~ 2s
Ksp = 4s^3
3,5 x 10^-5 = 4s^3
s = 2,06 x 10^-2

X(OH)3 => X3+ + 3OH-
s ~ s ~ 3s
Ksp = s x (3s)^3 = 27s^4
1,7 x 10^-6 = 27s^4
s = 1,58 x 10^-2

AgNO3 => Ag+ + No3-
s ~ s ~s
Ksp = s^2
1,6 x 10^-9 = s^2
s = 4 x 10^-5

CaCo3 => Ca2+ + co3 2-
s ~ s ~ s
Ksp = s^2
3 x 10^-5 = s^2
s = 5,5 x 10^-3

Yang paling mudah larut : Yang memiliki s paling besar.
jadi yg paljng mudah larut adalah L(OH)2