When chlorine (Cl2) gas is added to water during the disinfection of drinking water, it hydrolyzes with the water to form hypochlorous acid (HOCI). The disinfection power of the acid HOCI is 88 times better than its conjugate base, OCI". The pka for HOCI is 7.5. Because the acidic form is a much better disinfectant, you want to maintain 77% of the total molar concentration in this form. What minimum pH should you target? Enter your answer rounded to one decimal place. Hint: You'll need to set up a system of two equations