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For a dibasic acid H2X, how do its two ionisation constants compare?
AKa1 is larger than Ka2
BKa2 is larger than Ka1
CKa1 is equal to Ka2
DBoth are equal to Kw
Answer & Solution
Correct answer: A. Ka1 is larger than Ka2
Removing a proton from the negative HX- ion is harder than from neutral H2X, so Ka1 exceeds Ka2.
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