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S9390

Sigma-Aldrich

Sodium phosphate dibasic heptahydrate

ACS reagent, 98.0-102.0%

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Synonym(s):
Disodium hydrogen phosphate heptahydrate, Disodium phosphate
Linear Formula:
Na2HPO4 · 7H2O
CAS Number:
Molecular Weight:
268.07
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

grade

ACS reagent

Quality Level

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 (SO42-): ≤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

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1 of 4

This Item
431478S24291.06574
assay

98.0-102.0%

assay

≥99.99% trace metals basis

assay

98.0-100.5% dry basis

assay

-

Quality Level

200

Quality Level

-

Quality Level

300

Quality Level

500

grade

ACS reagent

grade

-

grade

-

grade

-

impurities

≤0.005% Insoluble matter

impurities

≤0.005% insolubles, <100 ppm total metallic impurities

impurities

-

impurities

-

pH

8.7-9.3 (25 °C, 5% in solution)

pH

8.7-9.3

pH

9.0-9.3 (25 °C, 50 g/L)

pH

8.7-9.3 (25 °C, 50 g/L in H2O)

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.

Storage Class

13 - Non Combustible Solids

wgk_germany

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable


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