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Question

In given reactions what are the eq.weight of H3PO4?
(1)H3PO4 + OH- = H2PO 4 + H2O
(2)H3PO4 + 2OH- = HPO42-+ H2O
(3)H3PO4 + 3OH- = PO43- + 3H2O

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Solution

Equivalent weight stands for Molecular weight/N factor N factor means H+ or OH- exchange in case of acid and bases respectively and in case of salts it is charge on cation.
Molecular Mass of H3PO4 is 98gm.
In first reaction one OH- is exchanged so equivalent weight = 98÷1=98gm.
In second Reaction Two OH- are exchanged, so equivalent weight = 98÷2 = 49gm.
In third reaction three OH- ions is exchanged, so equivalent weight = 98÷3 = 32.666667gm.

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