5. Solubility product, Ksp. (+3.5) Engineers in South Africa are hired to determine whether a river that passes through a pyrochroite (Mn(OH)2) deposit meets the standards for drinking water (drinking water standard for Mn = 50 ppb). The river is in contact with solid Mn(OH)2 (pKsp = 14.3) and has apH of 8.0. Determine the concentration of Mn2+ in the river in mg/L. Also, determine the pH at which the concentration of Mn2* would meet the drinking water standard. (Answers: [Mn2*] = 275.2 mg/L;pH=9.87). M n(O H)_{2} \leftrightarrow M n^{2+}+2 O H^{-}