An industrial wastewater contains 10-2 M of sodium bisulfide, NaHS, and 10-35 M of the monoprotic acid, CH5COOH. a) Determine the concentration of all species at equilibrium. b) If wastewater is to be treated with hydrochloric acid, HCl, prior to its discharge in the nearby river, how much acid is required to reduce the pH to 6.7? Solve analytically, assume a closed system and neglect ionic strength effects. Show all pertinent equations. Data: pK = 4.87 for CH5COOH; pKa1 = 7.02 and pKa2 = 13.9 for the sulfide system.