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 |