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15. 50 ml of a solution which is 0.050 M in the acid HA, pKa =...

15. 50 ml of a solution which is 0.050 M in the acid HA, pKa = 3.80 and 0.10 M in HB, pKa = 8.20, is titrated with 0.2 M NaOH. Calculate the pH
(a) at the first equivalence point and
(b) at the second equivalence point.
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