Practice question
Question
A weak acid HX ( Ka = 3.2 × 10⁻⁵ ) is mixed with 0.04 M NaX in a 2:1 volume ratio (acid:salt). If [HX] = 0.06 M after mixing, what is the pH?
Explanation
Total volume = 3V, [X-] = (0.04V/3V) = 0.0133 M , pKa = 4.5 , pH = 4.5 + log (0.0133/0.06) = 4.5 - 0.655 = 4.85 .
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