\(\Rightarrow s_{1}=\sqrt{K_{s p}}=\sqrt{6.2 \times 10^{-13}}\)
\(=7.87 \times 10^{-7} \mathrm{mol} \mathrm{L}^{-1}\)
For \(N Y_{3}: K_{s p}=27 s_{2}^{4}\)
\(\Rightarrow s_{2}=\sqrt[4]{\frac{6.2 \times 10^{-13}}{27}}\)
\(=3.89 \times 10^{-4} \mathrm{mol} \mathrm{L}^{-1}\)
Hence, molar solubility of \(MY\) in water is less than that of \(NY_3\) .