Question 15.8: Write expressions for Ksp for each ionic compound. (a) BaSO4......
Write expressions for K_{\text {sp }} for each ionic compound.
(a) \mathrm{BaSO}_{4}
(b) \mathrm{Mn}(\mathrm{OH})_{2}
(c) \mathrm{Ag}_{2} \mathrm{CrO}_{4}
To write the expression for K_{\mathrm{sp}}, first write the chemical reaction showing the solid compound in equilibrium with its dissolved aqueous ions. Then write the equilibrium expression based on this equation.
(a) \mathrm{BaSO}_{4}(s) \rightleftharpoons \mathrm{Ba}^{2+}(a q)+\mathrm{SO}_{4}{ }^{2-}(a q)
K_{\mathrm{sp}}=\left[\mathrm{Ba}^{2+}\right]\left[\mathrm{SO}_{4}{ }^{2-}\right]
(b) \mathrm{Mn}(\mathrm{OH})_{2}(s) \rightleftharpoons \mathrm{Mn}^{2+}(a q)+2 \mathrm{OH}^{-}(a q)
K_{\mathrm{sp}}=\left[\mathrm{Mn}^{2+}\right]\left[\mathrm{OH}^{-}\right]^{2}
(c) \mathrm{Ag}_{2} \mathrm{CrO}_{4}(\mathrm{~s}) \rightleftharpoons 2 \mathrm{Ag}^{+}(a q)+\mathrm{CrO}_{4}{ }^{2-}(a q)
K_{\mathrm{sp}}=\left[\mathrm{Ag}^{+}\right]^{2}\left[\mathrm{CrO}_{4}{ }^{2-}\right]