Ka = 10-6.4.
[A-]/[HA] = 0.01 = 10-2.
HA ⇄ H+ +A-
Ka = [H+][A-]/[HA] = 10-6.4.
[H+] = Ka/ ([A-]/[HA]) = 10-6.4/10-2 = 10-4.4.
pH = -log10[H+] = -log1010-4.4 = 4.4.
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