S9390
Sodium phosphate dibasic heptahydrate
ACS reagent, 98.0-102.0%
Synonym(s):
Disodium hydrogen phosphate heptahydrate, Disodium phosphate
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About This Item
Linear Formula:
Na2HPO4 · 7H2O
CAS Number:
Molecular Weight:
268.07
NACRES:
NA.21
PubChem Substance ID:
UNSPSC Code:
12352302
EC Number:
237-707-0
MDL number:
Assay:
98.0-102.0%
Grade:
ACS reagent
Form:
powder
grade
ACS reagent
Quality Segment
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
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.
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Storage Class
13 - Non Combustible Solids
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
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