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Equivalent mass of H(3)PO(2) when it dis...

Equivalent mass of `H_(3)PO_(2)` when it disproportionate into `PH_(3) and H_(3)PO_(3)` is:

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(a). Mw of `H_2PO_2=3xx1+31+2xx16=66`
`4e^(-)+H_3PO_2toPH_3`
`H_2PO_2toH_3PO_3+2e^(-)`
`Ew=((Mw)/(4)+(Mw)/(2))=Mw((1)/(4)+(1)/(2))`
`=(3Mw)/(4)=(3)/(4)xx66=49.5`
(b). `H_3PO_2` in monobasic acid
so it gives one `H^(o+)`
`Ew=(Mw)/(1)=66`.
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