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Question

If Ka1, Ka2 and Ka3 be the first, second and third ionization constant of H3PO4 and Ka1Ka2Ka3, then which of the following is/are correct?

A
[H+]=Ka1[H3PO4]
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B
[H+][HPO24]
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C
Ka2[HPO24]
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D
[HPO24]=[PO34]
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Solution

The correct options are
A [H+]=Ka1[H3PO4]
C Ka2[HPO24]
(A) Ka1=[H+][H2PO4]H3PO4=[H+]2H3PO4 as [H+][H2PO4]

Hence, [H+]=Ka1[H3PO4]

(B)[H+][H2PO4][HPO24]

(C) Ka2=[H+][HPO24][H2PO4][HPO24] as [H+][H2PO4]

(D) [HPO24]>>[PO34] as Ka2>>Ka3

Hence, option A and C are correct.

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