Practice question
Question
A weak acid HX ( Ka = 2.0 × 10⁻⁵ ) is mixed with 0.06 M NaX in a 1:2 volume ratio (acid:salt). If [HX] = 0.04 M after mixing, what is the pH?
Explanation
Total volume = 3V, [X-] = (0.06 × 2V/3V) = 0.04 M , pKa = 4.7 , pH = 4.7 + log (0.04/0.04) = 4.7 .
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