Practice question
Question
A weak acid HX ( Ka = 4.0 × 10⁻⁶ ) is mixed with 0.03 M NaX in a 2:1 volume ratio (acid:salt). If [HX] = 0.08 M after mixing, what is the pH?
Explanation
Total volume = 3V, [X-] = (0.03V/3V) = 0.01 M , pKa = 5.4 , pH = 5.4 + log (0.01/0.08) = 5.4 - 0.903 = 4.5 .
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