Establish the Ka expression of the dissolution of hypochlorous acid (HOCl) and determine the pH using an ICE chart

We will solve this problem through these steps:

**Step 1:** Write an equation for the dissociation of HOCl

**Step 2****:** Write an expression for the K_{a}.

**Step 3****:** Set up an ICE table to calculate the H_{3}O^{+} ion concentration.

Calculate the pH of a 0.400 M solution of hypochlorous acid, for which the K_{a} value is 2.90 x 10^{-8}. Enter your answer with two decimal places.

a. 3.97

b. 4.22

c. 4.78

d. 4.92

e. 6.22