The solubility of BaSO4 in water is 2.42×10-3 g L-1 at 298 K. The value of its solubility product Ksp will be (Given molar mass of BaSO4=233 g mol-1)

Solubility of BaSO4,s=2.42×10-3233 mol L-1=1.04×10-5 mol L-1BaSO4 ionizes completely in the solution as : BaSO4(s)⇌Ba 2++SO42-Ksp=Ba2+SO42-=s2=1.04×10-52=1.08×10-10 mol2 L-2