Hi the simple formula is pH = 1/2 (pKa1 + pKa2) because all these are amphiprotic salts, pKa = -log(Ka)
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a) pH = 4.67
b) pH = 2.76
c) pH = 4.16
d) pH = 4.54
e) pH = 10.5
f) pH = 8.39
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