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Practice question

MCQ

Question

A weak acid HX ( Ka = 1.0 × 10⁻⁵ ) and its salt NaX are mixed in equal volumes of 0.2 M and 0.1 M solutions, respectively. What is the pH?

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Choose one · Correct answer highlighted

Explanation

After mixing: [HX] = (0.2/2) = 0.1 M , [X-] = (0.1/2) = 0.05 M . pH = pKa + log ([X-]/[HX]) = 5 + log (0.05/0.1) = 5 - 0.301 = 4.7 .

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