71650

Sigma-Aldrich

Sodium phosphate dibasic dodecahydrate

puriss. p.a., crystallized, ≥99.0% (T)

Synonym(s):
Disodium phosphate, di-Sodium hydrogen phosphate dodecahydrate, sec-Sodium phosphate, Disodium hydrogen phosphate dodecahydrate
Linear Formula:
Na2HPO4 · 12H2O
CAS Number:
Molecular Weight:
358.14
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

Quality Level

grade

puriss. p.a.

assay

≥99.0% (T)

form

crystals

quality

crystallized

pH

9.0-9.3 (25 °C, 50 mg/mL in H2O)

solubility

water: soluble 35.8 g/L at 20 °C

anion traces

chloride (Cl-): ≤5 mg/kg
fluoride (F-): ≤5 mg/kg
sulfate (SO42-): ≤50 mg/kg

cation traces

As: ≤0.5 mg/kg
Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
K: ≤50 mg/kg
Mg: ≤5 mg/kg
Mn: ≤5 mg/kg
Ni: ≤5 mg/kg
Pb: ≤5 mg/kg
Zn: ≤5 mg/kg

SMILES string

O.O.O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].OP([O-])([O-])=O

InChI

1S/2Na.H3O4P.12H2O/c;;1-5(2,3)4;;;;;;;;;;;;/h;;(H3,1,2,3,4);12*1H2/q2*+1;;;;;;;;;;;;;/p-2

InChI key

DGLRDKLJZLEJCY-UHFFFAOYSA-L

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General description

Sodium phosphate is a colorless crystalline sodium salt. It is widely used as a buffer in molecular biology, biochemistry, and chromatographic studies. It exists in three forms: monobasic (NaH2PO4), dibasic (Na2HPO4), and tribasic (Na3PO4). Monobasic and dibasic forms in varying ratios are commonly used to compose the neutral sodium phosphate buffer solution.

Application

Sodium phosphate dibasic dodecahydrate may be used to prepare the 0.1M phosphate buffer having pH 7.4.

Packaging

1 kg in poly bottle

storage_class_code

13 - Non Combustible Solids

WGK Germany

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

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