Calculate the ph of a 0.10 m solution of hypochlorous acid, hocl. ka of hocl is 3.5*10-8 at 25 ∘c. express your answer numerically using two decimal places.

Question

Chemistry

Malachi

9 February, 16:31

Calculate the ph of a 0.10 m solution of hypochlorous acid, hocl. ka of hocl is 3.5*10-8 at 25 ∘c. express your answer numerically using two decimal places.

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Answers (1)

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June Kline · Answer 1

4.23.

Explanation:

∵ pH = - log[H⁺].

For weak acids:

∵ [H⁺] = √ (ka) (c).

∴ [H⁺] = √ (3.5 * 10⁻⁸) (0.10 M) = 5.92 x 10⁻⁵.

∴ pH = - log[H⁺] = - log (5.92 x 10⁻⁵) = 4.2279 ≅ 4.23.