7. Seneca Lake, a freshwater lake with a surface area of 173 km and an average depth of 922 m, is the largest and deepest of the 17 Finger Lakes in central New York State. The sediments of the lake are found to contain significant amounts of calcium carbonate (Caco...). The concentration of calcium ions (Ca**) in the lake is 43 mg/L, and the pH of the lake is 8.6. The relevant reactions are given in your notes (Carbonate System Chemistry). a. Assuming that the water in the lake is in equilibrium with Caco, calculate the concentrations of H", OH,Co," and HCO,, in the lake. Report your answers in mol/L. b. Calculate the alkalinity of the lake. Report your answer in as moles/L. c. Calculate the total moles of He could be neutralized by the alkalinity of the lake. Ans: a) OH = 3.16 *10* moles/LCO, 4.25 x 10 moles/LHCO, -2.87*10* moles/L, 3.0 x 10 ml) 4.77 10moles