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Acid Catalysed Hydrolysis of Esters

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Question

what happen when phosphorous acid is heated ?

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Solution

Phosphorous acid (H₃PO₃) on heating at about 200⁰C yields phosphoric acid and phosphine as:
4 H₃PO₃ --- heat--> 3H₃PO₄ (phosphoric acid) + PH₃ (Phosphine)

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