Given, Solubility product for CaSO4(Ksp)=9.0×10−6 Gram value of CaSO4=2g Suppose solubility of CaSO4 in water is 'S'. CaSO4⇌
2+
Ca
(aq)+SO42−(aq) Here, Ksp(CaSO4)=S2 S2=9.0×10−6 S=3×10−3 Molar mass of CaSO4=136 Solubility of CaSO4=3×10−3 When, 2g of CaSO4 dissolve in water. ∵ Solubility =