Practice question
Question
A weak acid HY ( Ka = 1.0 × 10⁻⁵ ) has a 0.2 M solution mixed with 0.1 M NaY in a 1:1 volume ratio. What is the pH?
Explanation
After mixing: [HY] = 0.1 M , [Y-] = 0.05 M , pKa = 5 , pH = 5 + log (0.05/0.1) = 5 - 0.301 = 4.7 .
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