Determine the pH of the solution formed when $45$ml of a $0\mathrm{.}15$M hypochlorous acid, $45$ml

of a $0\mathrm{.}10$M sodium hypochlorite and $10$ml of a $0\mathrm{.}10$M hydrogen bromide solution are

mixed together. Assume that volumes are additive.

Write down all the reaction equations needed to solve this exercise. $(10$ pts$)$