Hypochloric acid is widely used as a water disinfectant and its efficiency is pH dependent. Consider an aqueous solution at 25C containing 103M of hypochloric acid HOCl(HOCl H++ClO). The acidity constant of HOCl at this temperature is 2.5108. The approximate distribution of dissolved species as a function of pH is shown on the speciation diagram below. Show on the plot the species for corresponding lines, the points indicating pH of the solution, pKa and the equilibrium composition of the HOCl solution. What species are dominant in what pH range? What are the concentrations of HOCl and ClO at pH=pKa