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Find the equivalent weight of H(3) PO(4)...

Find the equivalent weight of `H_(3) PO_(4)` in each of the following reactions:
`H_(3) PO_(4) + OH^(-) to H_(2) PO_(4)^(-) + H_(2) O`
`H_(3) PO_(4) + 2OH^(-) to HPO_(4)^(2-) + 2H_(2) O`
`H_(3) PO_(4) + 3OH^(-) to PO_(4)^(3-) + 3H_(2) O`

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For H_(3)PO_(4) , H_(3)PO_(4) hArr H_(2)PO_(4)^(-) + H^(+) (K_(1)) H_(2)PO_(4)^(-) hArr HPO_(4)^(2-) + H^(+) (K_(2)) HPO_(4)^(2-) hArr PO_(4)^(3-) + H^(+) (K_(3)) then

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