At a certain temperature, the solubility of strontium arsenate, Sr3(AsO4)2, is 0.0510 g/L. What is the Ksp of this salt at this temperature?

Answer 1

.......Sr3(AsO4)2 ==> 3Sr^2+ + 2AsO4^3-
solubility...x........3x........2x

x = 0.0510g/L. Convert to mol/L, then substitute into Ksp expression.