Di Sodium Phosphate
Disodium phosphate (DSP), or disodium hydrogen phosphate, or sodium phosphate dibasic, is the inorganic compound with the formula Na2HPO4. It is one of several sodium phosphates. The salt is known in anhydrous form as well as forms with 2, 7, 8, and 12 hydrates. All are water-soluble white powders; the anhydrous salt being hygroscopic.
The pH of disodium hydrogen phosphate water solution is between 8.0 and 11.0, meaning it is moderately basic:
- HPO42− + H2O ⇌ H2PO4− + OH−
Application
Used to clarify the cane juice and to make sugar with better lustre and quality. In Food and beverages, used as acidifying agent and as tart flavouring agent in beverages such as various colas. It is used in the manufacture of industrial cleaning products, other inorganic and organic phosphoric chemicals, foundry resins, paints, enamels and refractory, antifreeze productions, and textile process materials. It is used in water treatment. Food grade phosphoric acid is used; as a acidulation in soft drink (particularly cola
| Chemical formula | Na2HPO4 |
|---|---|
| Molar mass | 141.96 g/mol (anhydrous) |
| Appearance | White crystalline solid |
| Odor | odorless |
| Density | 1.7 g/cm3 |
| Melting point | 250 °C (482 °F; 523 K) decomposes |
| Solubility in water | 7.7 g/100 ml (20 °C) |
| Solubility | insoluble in alcoho |
| log P | -5.8 |
| Acidity (pKa) | 2.15, 6.82, 12.35 |
| Magnetic susceptibility (χ) | −56.6·10−6 cm3/mol |
| Refractive index (nD) | 1.35644..1.35717 at 20°C |
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