Sodium phosphate dibasic
SIGALD/04276 - puriss., meets analytical specification of Ph. Eur., BP, USP, FCC, E 339, anhydrous, 98-100.5% (calc. to the dried substance)
Synonym: sec-Sodium phosphate; Disodium hydrogen phosphate; Disodium phosphate; Sodium hydrogenphosphate
CAS Number: 7558-79-4
Empirical Formula (Hill Notation): Na2HPO4
Molecular Weight: 141.96
EC Number: 231-448-7
MDL Number: MFCD00003496
Linear Formula: Na2HPO4
Product Type: Chemical
agency | meets analytical specifications of BP |
meets analytical specifications of Ph. Eur. | |
meets analytical specifications of USP | |
anion traces | chloride (Cl-): ≤50 mg/kg |
fluoride (F-): ≤10 mg/kg | |
sulfate (SO42-): ≤200 mg/kg | |
assay | 98-100.5% (calc. to the dried substance) |
cation traces | As: ≤2 mg/kg |
Cd: ≤1 mg/kg | |
Cu: ≤10 mg/kg | |
Fe: ≤20 mg/kg | |
Hg: ≤1 mg/kg | |
Pb: ≤4 mg/kg | |
Zn: ≤10 mg/kg | |
form | powder |
grade | puriss. |
impurities | reducing matter, complies |
residual solvents, complies | |
≤0.001% heavy metals (as Pb) | |
≤0.002% ammonium (NH4) | |
≤0.2% water-insoluble matter | |
≤1% NaH2PO4 (calc. to dried subst.) | |
≤2.0% pyrophosphate (as Na4P2O7) | |
InChI | 1S/2Na.H3O4P/c;;1-5(2,3)4 |
InChI key | BNIILDVGGAEEIG-UHFFFAOYSA |
loss | ≤1% loss on drying, 105°C, 4h |
≤1% loss on drying, 130 °C | |
pH | 8.4-9.6 (20 °C, 1%) |
pKa (25 °C) | (1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid) |
quality | meets analytical specification of Ph. Eur., BP, USP, FCC, E 339 |
Quality Level | 200 ![]() |
SMILES string | [Na+].[Na+].[H]OP([O-])([ |
solubility | alcohol: insoluble |
H2O: soluble 8 parts | |
H2O: very soluble (Hot) | |
suitability | complies for appearance of solution |
Application: | Sodium phosphate dibasic has been used for preparing phosphate buffer which in turn is utilized in X-gal staining. |
Biochem/physiol Actions: | Sodium phosphate dibasic is an important component of running buffer of denaturing gel electrophoresis. It induces glomerular calcification as well as other nephrotic syndrome in Sprague-Dawley rats. |
WGK Germany | WGK 1 |
Flash Point(F) | Not applicable |
Flash Point(C) | Not applicable |
Purity | 98-100.5% (calc. to the dried substance) |
UNSPSC | 12161700 |