Textbook Problem

. Teeth and bones are composed, to a first approximation, of calcium phosphate. ${\text{Ca}}_3{\left({\text{PO}}_{\text{4}}\right)}_{\text{2}}\left(s\right)$. The K for this salt is $1.3\times {10}^{-32}$at 25 °C. Calculate the concentration of calcium ion in a saturated solution of ${\text{Ca}}_3{\left({\text{PO}}_{\text{4}}\right)}_2$.