The following observations are made about a diprotic acid H2A:
(i) A 0.10 M solution of H2A has pH=3.30.
(ii) A 0.10 M solution of the salt NaHA is acidic.
Which of the following could be the value of pKa2 for H2A:
a) 9.23 b) 2.38 c) 6.52 d) 5.01
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