Question

If a saturated solution prepared by dissolving solid BaSO4 in water has [Ba2+] = 1.11 ×10−5M, what is the value of Ksp for BaSO4?

Answer 1

[Ba+2] = 1.11 ×10−5M = S

BaSO4 <---------------------------> Ba+2 + SO4-2

                                                     S             S

Ksp = [Ba+2][SO4-2]

Ksp = S x S

Ksp = S^2

Ksp = (1.11 x 10^-5)^2

Ksp = 1.23 x 10^-10