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Question

What happens when white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO2?

Solution
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White phosphorous dissolves in boiling NaOH solution (in a CO2 atmosphere) to give phosphine (PH3). The reaction is as follows:

P4 + 3NaOH + 3H2O PH3phosphine + 3NaH2PO2

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