What is the pH of 0.50 M HClO? The K_a of HClO is 3.5 10^-8.

Name: What is the pH of 0.50 M HClO? The K a of HClO is 3.5 10 -8 .
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Question

Quizplus · Accepted Answer

HClO is a weak acid, so we can use the formula: pH = pKa + log ([base]/[acid])
pKa = 3.5
[HClO] = 0.50 M
[ClO-] = 0 M (since no base is added)
pH = 3.5 + log (0/0.50)
pH = 3.5 - infinity (since log 0 = - infinity)
pH = 3.5 - ∞ = 3.5 Since the pH is less than 7, the solution is acidic. Therefore, the correct answer is D (3.9).

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