دی سدیم هیدروژن فسفات انهیدروس
| Formula (Hill): | HNa2O4P |
| Chemical formula: | Na2HPO4 |
| Molar mass: | 141.96 g/mol |
| Bulk density: | ~ 880 kg/m3 |
| CAS NUMBER: | 7558-79-4 |
| HS code: | 28352200 |
| EC number: | 231-448-7 |
| Storage (temperature) | Without limitations. |
| SDS | Available |
| RTECS: | WC4500000 |
| Odour: | Odourless |
| Form: | Solid |
| Color: | Colourless |
| pH value: | 8.7 9.3 (20g/l 20 ºC) |
| Solubility in water: | 77 g/l (20 ºC) |
| Solubility in ethanol: | Slightly soluble |
| Melting point: | ~ 250 ºC |
| Thermal decomposition: | >250 ºC |
| Assay | 98.0 – 100.5 | % | |
| Description | Conforms | ||
| Solubility | Conforms | ||
| Identification | Conforms | ||
| Heavy metals | ≤ | 0/002 | |
| Sulfate | ≤ | 0/2 | % |
| Chloride | ≤ | 0/06 | % |
| Insoluble substances | ≤ | 0/4 | % |
| Loss on drying | ≤ | 5 | % |
Disodium hydrogen phosphate anhydrous (Na₂HPO₄) is the water-free form of the compound, typically used in applications where moisture must be minimized. It appears as a white, odorless powder and is highly soluble in water.
🏭⚗️ Synthesis
It is obtained by neutralizing phosphoric acid with sodium hydroxide or sodium carbonate, followed by drying to remove all water of crystallization and obtain the anhydrous form.
🧪 Applications
• Ideal for formulations requiring low moisture content
• Used in buffer preparation for food, pharmaceuticals, and cosmetics
• Employed in water treatment, ceramics, and chemical manufacturing
⚠️ Hazards
May cause irritation to the eyes, skin, and respiratory tract. Proper handling procedures and protective gear are recommended.
