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How can it be proved that PH(3) is basic...

How can it be proved that `PH_(3)` is basic in nature?

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`PH_(3)`, reacts with acids like HI to form `Ph_(4)l`. This shows that `PH_(3)`, is basic in nature.
`H_(3)P + HI rarr [PH_(4)^(-)]` Phosphine Hydrogen iodide
Phosphonium iodide Due to the presence of a lone pair of electrons on P, PH, acts as a Lewis base in the above reaction
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