Red phosphorus was oxidized with boiling nitric acid. The gas released during this process was absorbed with a potassium hydroxide solution

bystudin | November 11, 2020 | Education

Red phosphorus was oxidized with boiling nitric acid. The gas released during this process was absorbed with a potassium hydroxide solution. The oxidation product in the first reaction was neutralized with sodium hydroxide, and a solution of calcium chloride was added dropwise to the resulting reaction mass until the precipitation ceased. Write the equations for the described reactions.

P + 5HNO3 → H3PO4 + 5NO2 + H2O
2NO2 + 2KOH → KNO2 + KNO3 + H2O
H3PO4 + 3NaOH → Na3PO4 + 3H2O
2Na3PO4 + 3CaCl2 → Ca3(PO4)2↓ + 6NaCl

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