Disodium hydrogen phosphate
CAS 7558-79-4
EC 231-448-7
Formula H3O4P.2Na
MW 141.96 g/mol
Salts & Minerals Food & NutritionPharmaceuticals & HealthcareWater Treatment Chelation & SequestrationpH Regulation & BufferingAntioxidant & Stabilizer
Description
Disodium hydrogen phosphate (Na2HPO4, CAS 7558-79-4) is an inorganic phosphate salt also known as disodium phosphate, soda phosphate, and E339ii. It is the disodium form of phosphoric acid and carries EC number 231-448-7.
In food and beverage manufacturing, Na2HPO4 acts as a buffering agent by donating or accepting protons to stabilise pH in processed cheeses, dairy products, and emulsified sauces. In water treatment, it sequesters calcium and magnesium ions through chelation, preventing scale formation in boilers and distribution pipework. Pharmaceutical formulators use it to maintain precise pH in parenteral solutions and topical preparations.
Disodium hydrogen phosphate is available in food-grade (E339ii, FCC), pharmaceutical-grade (Ph.Eur.), and technical-grade forms as a white granular powder. It is compliant with REACH regulations and supplied across Europe in 25 kg bags and bulk quantities. Relevant HS code for import and export classification is 28352200.
In food and beverage manufacturing, Na2HPO4 acts as a buffering agent by donating or accepting protons to stabilise pH in processed cheeses, dairy products, and emulsified sauces. In water treatment, it sequesters calcium and magnesium ions through chelation, preventing scale formation in boilers and distribution pipework. Pharmaceutical formulators use it to maintain precise pH in parenteral solutions and topical preparations.
Disodium hydrogen phosphate is available in food-grade (E339ii, FCC), pharmaceutical-grade (Ph.Eur.), and technical-grade forms as a white granular powder. It is compliant with REACH regulations and supplied across Europe in 25 kg bags and bulk quantities. Relevant HS code for import and export classification is 28352200.
Physical Properties
| Melting Point | 250 °C |
| Density | 1.064 g/mL at 20 °C |
| Appearance | white granular powder |
| Color | White |
| Odor | odorless |
| Form | powder |
| Water Solubility | >=10 g/100 mL at 20 ºC |
| Vapor Pressure | 0Pa at 20℃ |
| pH | 8.9-9.2 (25℃, 50g/L in water) |
| Log P | -2.15 |
Safety & Handling (Learn More)
Warning GHS07
H
H319
P
P280P264+P265P337+P317P305+P351+P338
Trade & Regulatory
| HS Code | 28352200 |
| UN Number | 3077 |
| ADR Class | 9 |
| Packing Group | III |
| WGK (Germany) | 3 |
Other Names
Sodium phosphate dibasicdi-Sodium hydrogen phosphateSodium Phosphate, DibasicE339iiNa2HPO4disodium phosphatedibasic sodium phosphateDSPSoda Phosphate
Related Products
Raw Materials
Derivatives
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