Bila Ksp CaCO3 = 2,5 × 10^-9, Ar Ca = 40, C = 12, dan O =16, maka kelarutan CaCO3 dalam 100mL air adalah

Kaco3 => ca²+ + co3²-
S. S
Ksp = s²
S = √ksp
= √25×10^-10
S = 5×10^-5

S = gr. 1000
—— ×———
Mr. V
S = gr. 1000
——— × ———
100. 100
S= gr
—— × 10
100
5×10^-5 = gr
——
10
Gr = 5×10^-5 × 10
= 5×10^-4