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How is pure phosphine prepared from ...

How is pure phosphine prepared from phosphorous acid ?

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Phosphine is prepared in pure form by heating phosphorous acid.
` underset(" Phosphorous acid " ) (4H_(3)PO_(3)) overset(Delta)to underset(" Ortho phosphoric acid " ) ( 3H_(3)PO_(4)) + underset(" Phosphine " )( PH_(3)) uarr `
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