Calculate the solubility of each of the following compounds in moles per liter and grams per liter. (Ignore any acid-base properties.)

a. \(\mathrm{Ag}_{3} \mathrm{PO}_{4}, K_{\text {sp }}=1.8 \times 10^{-18}\)

b. \(\mathrm{CaCO}_{3}, K_{\mathrm{sp}}=8.7 \times 10^{-9}\)

c. \(\mathrm{Hg}_{2} \mathrm{Cl}_{2}, K_{\mathrm{sp}}=1.1 \times 10^{-18}\)

\(\left(\mathrm{Hg}_{2}{ }^{2+}ight.\) is the cation in solution.)