1)
Ni(OH)2 <------------------> Ni+2 + 2 OH-
                                           Â
SÂ Â Â Â Â Â Â Â Â Â
2S
Ksp = [Ni+2][OH-]^2
5.84 × 10^-16 = S x (2S)^2
5.84 × 10^-16 = 4S^3
S = 5.27 x 10^-6 M
solubility = 5.27 x 10^-6 x 92.7
solubility = 4.88 x 10^-4 g/L
2)
CaSO4 <---------------> Ca+2 + SO42-
                                       Â
SÂ Â Â Â Â Â Â Â Â Â
0.350
Ksp = [S][0.350]
4.93× 10^–5 = S x 0.350
S = 1.408 x 10^-4 M
solubility = 1.408 x 10^-4 x 136.14
            Â
= 0.0192 g/L
