Question
Show that phosphine is weakly basic?
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Answer
Phosphine is weakly basic and forms phosphonium salts with halogen acids.
$PH _3+ HI \rightarrow PH _4 I$
$PH _4 I + H _2 O \overset{\triangle}{\longrightarrow} PH _3+ H _3 O ^{-}+ I ^{-}$
$PH _3+ HI \rightarrow PH _4 I$
$PH _4 I + H _2 O \overset{\triangle}{\longrightarrow} PH _3+ H _3 O ^{-}+ I ^{-}$
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