Daily Uses:
- Used in metal polishes to prevent oxidation.
- Added to canned vegetables to maintain firmness.
- Found in industrial detergents for heavy-duty cleaning.
Application Fields:
- Metal treatment, food preservation, detergents, water softening.
Synthesis Method:
- Condensation: Heat potassium orthophosphate (K₃PO₄) with phosphoric acid (H₃PO₄) at 200–300°C.
- Chemical equation: \(2K_3PO_4 + H_3PO_4 \xrightarrow{\Delta} K_4P_2O_7 + 3KOH\)
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