What is the pH of a 0.023 M solution of HCN (K_a = 4.9 x 10^-10) A) 1.64 B) 10.95 C) 3.05 D) 5.47 E) 4.97

Name: What is the pH of a 0.023 M solution of HCN (K a = 4.9 x 10 -10 ) A) 1.64 B) 10.95 C) 3.05 D) 5.47 E) 4.97
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Quizplus · Accepted Answer

HCN is a weak acid, and its pH can be calculated using the formula for weak acids: pH = -log(sqrt(Ka * C)). Substituting the given values, pH = -log(sqrt(4.9 x 10^-10 * 0.023)) ≈ 5.47.

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