S9390

Sodium phosphate dibasic heptahydrate

ACS reagent, 98.0-102.0%

• Synonym(s): Disodium hydrogen phosphate heptahydrate, Disodium phosphate
• Linear Formula: Na₂HPO₄ · 7H₂O
• CAS Number: 7782-85-6
• Molecular Weight: 268.07
• EC Number: 237-707-0
• MDL number: MFCD00149180
• UNSPSC Code: 12352300
• PubChem Substance ID: 329824623
• NACRES: NA.21

Properties

• grade: ACS reagent
• Quality Level: 200
• vapor density: 4.9 (vs air)
• Assay: 98.0-102.0%
• form: powder
• impurities: ≤0.005% Insoluble matter
• pH: 8.7-9.3 (25 °C, 5% in solution)
• density: 1.68 g/mL at 25 °C (lit.)
• anion traces: chloride (Cl^-): ≤0.001%; sulfate (SO₄^2-): ≤0.005%
• cation traces: Fe: ≤0.001%; heavy metals: ≤0.001% (by ICP)
• SMILES string: O.O.O.O.O.O.O.[Na+].[Na+].OP([O-])([O-])=O
• InChI: 1S/2Na.H3O4P.7H2O/c;;1-5(2,3)4;;;;;;;/h;;(H3,1,2,3,4);7*1H2/q2*+1;;;;;;;;/p-2
• InChI key: PYLIXCKOHOHGKQ-UHFFFAOYSA-L

Description

General description

Sodium phosphate dibasic heptahydrate is a hydrated form of disodium phosphate (DSP) or disodium hydrogen orthophosphate. DSP is widely used as a pH regulator and saline laxative.

Application

A mixture of sodium phosphate dibasic heptahydrate, potassium phosphate monobasic, and NaCl in deionized water is used for the preparation of phosphate-buffered saline (PBS, pH 7.4). PBS is used as a buffer solution in biological research to keep the pH constant.

Safety Information

• Storage Class Code: 13 - Non Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable