Write the reaction equations: Phosphorus → Phosphorus (V) oxide → Orthophosphoric acid → Potassium phosphate

Write the reaction equations: Phosphorus → Phosphorus (V) oxide → Orthophosphoric acid → Potassium phosphate → Calcium phosphate → Phosphorus. In the equations of redox reactions, indicate the oxidation states and indicate the transition of electrons or draw up an electronic balance diagram. For ion exchange reactions, write ionic equations

Phosphorus → Phosphorus (V) oxide → Orthophosphoric acid → Potassium phosphate → Calcium phosphate → Phosphorus.

P → P2O5 → H3PO4 → K3PO4 → Ca3 (PO4) 2 → P

1) 4P + 5O2 → 2P2O5;

P (0) – 5e → P (+5) 5 4 – reducing agent, oxidation process;

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O2 + 4e → 2O (-2) 4 5 – oxidizing agent, reduction process;

2) P₂O₅ + 3H₂O → 2H₃PO₄;

3) H₃PO₄ + 3KOH → K₃PO₄ + 3H₂O;

3H⁺ + PO₄^3- + 3K⁺ + 3OH^– → 3K⁺ + PO₄^3- + 3H₂O;

3H⁺ + 3OH^– → 3H₂O;

4) 2K₃PO₄ + 3CaCl₂ → Ca₃(PO₄)₂↓ + 6KCl;

6K⁺ + 2PO₄^3- + 3Ca²⁺ + 6Cl^– → Ca₃(PO₄)₂↓ + 6K⁺ + 6Cl^–;

2PO₄^3- + 3Ca²⁺ → Ca₃(PO₄)₂↓;

5) 2Сa₃(PO₄)₂ + 10C + 6SiO₂ →  6CaSiO₃ + P₄ + 10CO;

P (+5) + 5e → P (0) 5 2 – oxidizing agent, reduction process;

C (0) – 2e → C (+2) 2 5 – reducing agent, oxidation process.