di-Sodium hydrogen phosphate, min. 98 %, Ph.Eur.,USP, anhydrous, 500 g, plastic

di-Sodium hydrogen phosphate is an anhydrous inorganic salt of pharmacopoeia quality supplied at a minimum purity of 98 % and conforming to Ph.Eur. and USP requirements. Identified by CAS number 7558-79-4, it has the empirical formula Na₂HPO₄ and a molar mass of 141,96 g/mol. This white phosphate salt is widely used to prepare buffer systems, adjust pH in analytical and pharmaceutical workflows, and support formulation work where controlled ionic strength is essential. The material is offered in a practical, suited to routine laboratory handling and medium-scale preparation. Produced by manufacturer Carl ROTH, the grade is intended for applications that call for documented pharmacopoeia compliance rather than general technical quality. As a classic dibasic sodium phosphate, it dissolves readily in water and pairs with monobasic phosphates to establish stable buffer ranges across physiological and analytical pH windows. Laboratories in quality control, research, and process development rely on such salts for reproducible media, calibration solutions, and sample preparation. The anhydrous form avoids additional crystal water, simplifying stoichiometric calculations when preparing defined molar solutions.

This article is part of Inorganic salts, in Inorganic chemicals.

Key features

• Assay (acidim., dry substance): 98,0-100,5 %
• pH value (5 % in H2O): 8,7-9,4
• Appearance of solution: complies
• In H2O insoluble matter: ≤0.4 %
• Loss on drying (105 °C): ≤1,0 %
• Loss on drying (130 °C): ≤5.0 %
• Chloride (Cl): ≤0.02 %
• Sulphate (SO4): ≤0.05 %
• Arsenic (As): ≤0.0016 %
• Iron (Fe): ≤0,002 %
• CAS number: 7558-79-4
• Pack sizes: 500 g, 1 kg, 5 kg
• Purity: min. 98 %
• Empirical formula: Na₂HPO₄
• Molar mass: 141,96 g/mol
• Technical Information Sheet:
• Safety Data Sheet: