Write the reaction equation: P- K3P- PH3- P2O5- H3PO4

1. Potassium react with red phosphorus.

3K + R = K3R.

2. Formation of phosphine during the reaction of water and potassium phosphine.

K3R + 3H2O = PH3 + 3KON.

3. Combustion of phosphine.

PH3 + O2 = P2O5 + H2O.

4. The reaction of phosphorus oxide with water – the formation of phosphoric acid.

P2O5 + 3H2O = 2H3PO4

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