9. a) Using your fractions from 8b, and a total carbonate concentration of 2 mM, determine the alkalinity of the water in meq/L. Show all work. B) Repeat for 8c 10. a) A lake water at pH = 7.4 is measured to have bicarbonate concentration = 80 mg HCO3-/L. Estimate the alkalinity of the lake in both meq/L and mg CaCO3/L. Show all work. B) Repeat if the pH = 9.4. 11. A lake water is measured to have alkalinity = 120 mg CaCO3/L with pH = 8.4. Determine the concentrations of all three carbonate species in mM.