Write down the reaction equations: a) phosphorus = phosphorus oxide (V) = phosphoric acid

| August 15, 2021 | education

Write down the reaction equations: a) phosphorus = phosphorus oxide (V) = phosphoric acid = sodium phosphate = calcium phosphate = phosphoric acid; b) phosphorus = phosphorus oxide (V) = potassium phosphate = calcium phosphate = phosphorus = magnesium phosphide

A) To implement the above chain of transformations, we need to carry out two reactions.

Phosphorus react with oxygen. As a result of the reaction, pentavalent phosphorus oxide is formed. The chemical equation for the reaction is as follows.

4 P + 5 O2 = 2 P2O5

Pentavalent phosphorus oxide react with water, as a result of the reaction orthophosphoric acid is formed. The chemical equation for the reaction is as follows.

P2O5 + 3 H2O = 2 H3PO4

Phosphoric acid react with sodium hydroxide. As a result of the reaction, sodium phosphate is formed and water is released.

H3PO4 +3 NaOH = Na3PO4 + 3 H2O

The reaction between sodium phosphate and potassium chloride, as a result of the reaction, calcium phosphate is formed, which precipitates, and sodium chloride is also formed.

2 Na3PO4 + 3 CaCl2 = Ca3 (PO4) 2 + 6 NaCl

Calcium phosphate react with sulfuric acid. As a result of the reaction, phosphoric acid and calcium sulfate are formed, which precipitate ..

Ca3 (PO4) 2 + 3 H2SO4 = 2 H3PO4 + 3 CaSO4

B) To carry out the above chain of transformations, we need to carry out two reactions.

Phosphorus react with oxygen. As a result of the reaction, pentavalent phosphorus oxide is formed. The chemical equation for the reaction is as follows.

4 P + 5 O2 = 2 P2O5

Pentavalent phosphorus oxide react with divalent potassium oxide, as a result of the reaction, potassium phosphate is formed. The chemical equation for the reaction is as follows.

P2O5 + 3 K2O = 2 K3PO4

Potassium phosphate react with calcium hydroxide, as a result of the reaction, potassium hydroxide and calcium phosphate are formed, which precipitate.

2 K3PO4 + 3 Ca (OH) 2 = Ca3 (PO4) 2 + 6 KOH

Phosphorus react with magnesium to form magnesium phosphate.

2 P + 3 Mg = Mg3P2.



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