Write the reaction equation: P → Ca3P2 → PH3 → P2O5 → H3PO4 → K3PO4

| May 25, 2021 | education

According to this chain, the chemical equations will look like this:

1) 3Ca + 2P → Ca3P2

Calcium react with red phosphorus to produce calcium phosphide. This reaction takes place at a temperature of 350-400 ° C.

2) Ca3P2 + 6H2O → 3Ca (OH) 2 + 2PH3

Calcium phosphide react with water to produce calcium hydroxide and phosphine. Impurities: diphosphine and hydrogen.

3) 2PH3 + 4O2 → P2O5 + 3H2O

Phosphine react with oxygen to produce phosphorus (V) oxide and water. Phosphine ignites in air at 150 ° C.

4) P2O5 + 3H2O → 2H3PO4

Phosphorus (V) oxide react with water to produce phosphoric acid. Industrial method for the production of phosphoric acid.

5) H3PO4 + 3KOH → K3PO4 + 3H2O

Phosphoric acid react with potassium hydroxide to produce potassium orthophosphate and water. Potassium hydroxide – concentrated solution. Phosphoric acid – diluted solution.



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