Problem: The Ka of hypochlorous acid (HClO) is 3.0 x 10-8 at 25.0 °C. Calculate the pH of a 0.0335 hypochlorous acid solution.a. 3.50b. 9.00c. 4.50d. 1.47e. 5.49

FREE Expert Solution

We are being asked to calculate the pH of a 0.0335 hypochlorous acid solution


Hypochlorous acid (HClO) has a low Ka, therefore we know that it is a weak acid.


Since we’re dealing with a weak acid and Ka is an equilibrium expression, we will have to create an ICE chart to determine the equilibrium concentration of each species:

HClOweak acidproton donor
H2O → will act as the weak baseproton acceptor


Equilibrium reaction:        HClO(aq) + H2O(l)  ClO-(aq) + H3O+(aq)

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Problem Details

The Ka of hypochlorous acid (HClO) is 3.0 x 10-8 at 25.0 °C. Calculate the pH of a 0.0335 hypochlorous acid solution.

a. 3.50
b. 9.00
c. 4.50
d. 1.47
e. 5.49

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