Sodium phosphate dibasic
Linear Formula: Na2HPO4
CAS Number: 7558-79-4
Molecular Weight: 141.96
General Description: Sodium phosphate dibasic is a sodium salt of phosphoric acid. It is highly hygroscopic and water-soluble compound used as a texturizer, emulsifier, and buffer. It can also be used as a reagent in water softeners, cleaners, and boiler treatments process. Sodium phosphate is widely used buffer in molecular biology, biochemistry, and chromatographic studies. It exists in three forms: monobasic (NaH2PO4), dibasic (Na2HPO4), and tribasic (Na3PO4). Monobasic and dibasic forms in varying ratios are commonly used to compose the neutral sodium phosphate buffer solution.
Quality Segment: 200
Grade: ACS reagent, puriss. p.a.
Assay: ≥99.0% (T)
Form: Powder (or crystals)
Impurities: ≤0.001% total nitrogen (N)
Loss on Drying: ≤0.2% at 105 °C
pH: 8.7-9.3 (25 °C, 50 mg/mL in H2O)
pKa (25 °C): (1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)
Chloride (Cl-): ≤10 mg/kg
Sulfate (SO42-): ≤50 mg/kg
