M_3 A_2 is a sparingly soluble salt of molar mass y g mol^-1 and solubility x g L^-1. The ratio of the molar concentration of the anion ( A^3-) to…

$\displaystyle \mathrm{M}_3 \mathrm{~A}_2$ is a sparingly soluble salt of molar mass $\displaystyle y \mathrm{~g} \mathrm{~mol}^{-1}$ and solubility $\displaystyle x \mathrm{~g} \mathrm{~L}^{-1}$. The ratio of the molar concentration of the anion $\displaystyle \left(\mathrm{A}^{3-}\right)$ to the solubility product of the salt is