Daily Uses:
- Used in laundry detergents to soften water and remove heavy stains.
- Added to processed cheeses to emulsify fats and improve melting properties.
- Found in metal cleaners to prevent rust.
Application Fields:
- Detergents, food emulsification, metal treatment, water softening.
Synthesis Method:
- Condensation reaction: Heat sodium orthophosphate (Na₃PO₄) with phosphoric acid (H₃PO₄) at 200–300°C.
- Chemical equation: \(2Na_3PO_4 + H_3PO_4 \xrightarrow{\Delta} Na_4P_2O_7 + 3NaOH\)
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