Then, the concentrations of the ions in the solution at equilibrium will be:
$$[Mg^{2+}] = 3s$$
$$[PO_4^{3-}] = 2s$$
We can use the solubility product constant (Ksp) to relate the concentrations of the ions:
$$K_{sp} = [Mg^{2+}]^3[PO_4^{3-}]^2$$
Substitute the
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