For the salt AB(s), the dissociation reaction is:
AB(s) <=> A^(+) + B^(-)
The molar solubility is x, so the equilibrium concentrations are:
[A^(+)] = x
[B^(-)] = x
Ksp = [A^(+)] * [B^(-)] = x * x = x^2
So, for AB(s), Ksp = $\boldsymbol{x^2}$.
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