The following observations are made about a diprotic acidH2A: (i) A 0.10 M solution of H2A has pH = 3.30. (ii) A 0.10 Msolution of the salt NaHA is acidic. Which of the followingcould be the value of pKa2 for H2A: (i) 3.22, (ii) 5.30,(iii) 7.47, or (iv) 9.82?

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