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5 November, 00:16

What is the pH of a buffer solution that is 0.211 M in hypochlorous acid (HClO) and 0.111 M in sodium hypochlorite? The Ka of hypochlorous acid is 3.8 ⋅ 10-8. What is the pH of a buffer solution that is 0.211 M in hypochlorous acid (HClO) and 0.111 M in sodium hypochlorite? The Ka of hypochlorous acid is 3.8 x 10-8.

a. 7.7

b. 0

c. 7.14

d. 14.28

e. 9.05

f. 6.86

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  1. 5 November, 01:32
    0
    c. 7.14

    Explanation:

    The buffer solution is formed by a weak acid (hypochlorous acid, HClO) and its conjugate base (hypochlorite ClO⁻, coming from sodium hypochlorite NaClO). We can calculate the pH using the Henderson-Hasselbach equation.

    pH = pKa + log [base]/[acid]

    pH = - log 3.8 * 10⁻⁸ + log 0.111/0.211

    pH = 7.14
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