Sodium Phosphate, Dibasic CAS#7558-79-4
Excellent Water Solubility & Hygroscopicity – Highly soluble and moisture-absorbing, ensuring rapid dissolution and stable performance in formulations.
Ideal Buffer Component – Commonly used with sodium phosphate monobasic to prepare reliable organic and biochemical buffer systems.
Nutritional & Physiological Support – Provides essential sodium and phosphate for normal nerve and muscle function and can be used as a dietary supplement.
Wide Food & Water Treatment Applications – Applied in food processing and water treatment, often in combination with trisodium phosphate for effective conditioning.
Products Description of Sodium Phosphate, Dibasic CAS#7558-79-4
Sodium phosphate dibasic is highly hygroscopic and readily soluble in water. It is commonly used together with sodium phosphate monobasic to prepare buffer solutions and is widely applied in biochemical and analytical assays. As a source of sodium and phosphate, it supports normal nerve and muscle function and can be used as a nutritional supplement. Sodium hydrogen phosphate is also utilized in food processing and water treatment, often in combination with trisodium phosphate.
Parameters
| Melting point | 243-245 °C |
| density | 1.064 g/mL at 20 °C |
| bulk density | 880kg/m3 |
| vapor density | 4.9 (vs air) |
| vapor pressure | 0Pa at 20℃ |
| FEMA | 2398 | DISODIUM PHOSPHATE |
| storage temp. | Store at +5°C to +30°C. |
| solubility | H2O: 0.5 M at 20 °C, clear, colorless |
| form | powder |
| color | White |
| Odor | odorless |
| PH | 8.9-9.2 (25℃, 50g/L in water) |
| pka | (1) 2.15, (2) 6.82, (3) 12.38 (at 25℃) |
| biological source | synthetic |
| Water Solubility | >=10 g/100 mL at 20 ºC |
| λmax | λ: 260 nm Amax: 0.019 |
| λ: 280 nm Amax: 0.016 | |
| Sensitive | Hygroscopic |
| Merck | 148,659 |
| Stability: | Stable. Incompatible with strong acids. Hygroscopic. |
| InChIKey | BNIILDVGGAEEIG-UHFFFAOYSA-L |
| LogP | -2.15 |
| CAS DataBase Reference | 7558-79-4(CAS DataBase Reference) |
| EPA Substance Registry System | Disodium phosphate (7558-79-4) |
| Absorption | ≤0.01 at 260nm |
| ≤0.01 at 280nm |
Safety Information
| Hazard Codes | Xi |
| Risk Statements | 36/37/38 |
| Safety Statements | 26-36-24/25 |
| RIDADR | UN 3077 9 / PGIII |
| WGK Germany | 3 |
| RTECS | WC4500000 |
| F | 3 |
| TSCA | Yes |
| HS Code | 28352200 |
| Hazardous Substances Data | 7558-79-4(Hazardous Substances Data) |
| Toxicity | LD50 orally in Rabbit: > 2000 mg/kg |
Product Application of Sodium Phosphate, Dibasic CAS#7558-79-4
Sodium phosphate dibasic is widely used as a laboratory reagent and buffering agent in chemical analysis. It is also applied in the manufacture of ceramics, detergents, and enamels, and serves as a mordant in textile dyeing. In industrial processing, it is used for fireproofing paper and wood, weighting and printing silk, and treating boiler water.
In the food and nutrition sectors, sodium phosphate dibasic functions as a sequestrant and dietary supplement, while in agriculture it is used in fertilizer formulations. It is also employed in soldering enamels and used therapeutically as a mild laxative.
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