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What is the general expression for Ka1 of a diprotic acid H₂A?
A. Ka1 = [H⁺][A²⁻]/[HA⁻]
B. Ka1 = [H⁺]²[A²⁻]/[H₂A]
C. Ka1 = [HA⁻]/[H₂A]
D. Ka1 = [H⁺][HA⁻]/[H₂A]
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