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: (i) 3.22, (ii) 5.30, (iii) 7.47, or (iv) 9.82?
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