Sodium Phosphate Dibasic Dodecahydrate (Na₂HPO₄·12H₂O) is an inorganic salt belonging to the phosphate family. The compound exists as a hydrated crystalline solid containing twelve molecules of water of crystallization. It is commonly used as a buffering agent owing to its ability to maintain stable pH levels in aqueous solutions.
CAS No.: 10039-32-4
Synonyms: Disodium phosphate dodecahydrate; Sodium hydrogenphosphate dodecahydrate; Disodium orthophosphate, dodecahydrate; disodium phosphate 12 hydrate
| Physical Properties | |
| Molecular formula | Na2HPO4 · 12H2O |
| IUPAC Name | disodium;hydrogen phosphate;dodecahydrate |
| Molecular weight | 358.14 g/mol |
| Chemical Properties | |
| Appearance (form) | Crystalline Solid Powder |
| Appearance (color) | White to Off-white |
| Solubility (in water) | 35.8 g/L at 20 °C |
| Density | 1.5 g/cm3 |
| Melting Point | 34°C |
| pH | 8.4-9.6 (20 °C, 1%) |
| Loss on drying | 57-61% |
| Assay | 98.5-102.5% |
| Pictograms : | None Required |
| Hazard Statements : | None Identified |
| Precautionary statements : | No additional information available |
Sodium Phosphate Dibasic Dodecahydrate (Na₂HPO₄·12H₂O) is an inorganic salt belonging to the phosphate family. The compound exists as a hydrated crystalline solid containing twelve molecules of water of crystallization. It is commonly used as a buffering agent owing to its ability to maintain stable pH levels in aqueous solutions.
CAS No.: 10039-32-4
Synonyms: Disodium phosphate dodecahydrate; Sodium hydrogenphosphate dodecahydrate; Disodium orthophosphate, dodecahydrate; disodium phosphate 12 hydrate
| Physical Properties | |
| Molecular formula | Na2HPO4 · 12H2O |
| IUPAC Name | disodium;hydrogen phosphate;dodecahydrate |
| Molecular weight | 358.14 g/mol |
| Chemical Properties | |
| Appearance (form) | Crystalline Solid Powder |
| Appearance (color) | White to Off-white |
| Solubility (in water) | 35.8 g/L at 20 °C |
| Density | 1.5 g/cm3 |
| Melting Point | 34°C |
| pH | 8.4-9.6 (20 °C, 1%) |
| Loss on drying | 57-61% |
| Assay | 98.5-102.5% |
| Pictograms : | None Required |
| Hazard Statements : | None Identified |
| Precautionary statements : | No additional information available |
Sodium phosphate dibasic is also known as disodium phosphate, though it may exist in different hydrated forms such as dodecahydrate.
It is highly soluble in water, making it suitable for aqueous formulations and buffer preparation.
It is used as a buffering agent, pH regulator, and reagent in laboratories, pharmaceuticals, food processing, and industrial applications.
