\(\mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2(\mathrm{~s}) \underset{3 \mathrm{~s}}{\rightleftharpoons} 3 \mathrm{Ca}^{2+}(\text { aq. })+2 \mathrm{PO}_4^{3-}(\text { aq. })\)

\(\mathrm{S}=\frac{\mathrm{W} \times 1000}{\mathrm{M} \times 100}=\frac{\mathrm{W} \times 10}{\mathrm{M}}\)

\(\mathrm{K}_{\mathrm{sp}}=(3 \mathrm{~s})^3(2 \mathrm{~s})^2\)

\(=108 \mathrm{~s}^5\)

\(=108 \times 10^5 \times\left(\frac{\mathrm{W}}{\mathrm{M}}\right)^{\mathrm{s}}\)

\(=1.08 \times 10^7\left(\frac{\mathrm{W}}{\mathrm{M}}\right)^5\)