Ksp Questions from generic salt

Question

A generic salt, AB, has a molar mass of 155 g/mol and a solubility of 7.40 g/L at 25 °C.

AB(s) =" At (ag) + B- (aq)

What is the Ksp of this salt at 25 °C?

Answer 1

AB(s) <=> A+(aq) + B-(aq)

Ksp = [A+][B-]

7.40 g/L x 1 mol/155g = 0.0477 mol/L

Ksp = (.0477)(0.0477) = 0.00228