Sodium phosphate dibasic dodecahydrate

Name: Sodium phosphate dibasic dodecahydrate
Brand: SIGALD

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

Synonym(s):

sec-Sodium phosphate, Disodium hydrogen phosphate dodecahydrate, Disodium phosphate, di-Sodium hydrogen phosphate dodecahydrate

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About This Item

Linear Formula:

Na₂HPO₄ · 12H₂O

CAS Number:

10039-32-4

Molecular Weight:

358.14

EC Number:

231-448-7

MDL number:

MFCD00149181

UNSPSC Code:

12161700

PubChem Substance ID:

329763400

NACRES:

NA.21

Assay:

≥99.0% (T)

Form:

crystals

Solubility:

water: soluble 35.8 g/L at 20 °C

Key Documents

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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 (SO₄^2-): ≤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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1 of 4

This Item	71649	71663	1.06579
Sigma-Aldrich 71650 Sodium phosphate dibasic dodecahydrate	Sigma-Aldrich 71649 Sodium phosphate dibasic dodecahydrate	Sigma-Aldrich 71663 Sodium phosphate dibasic dodecahydrate	Supelco 1.06579 di-Sodium hydrogen phosphate dodecahydrate
form crystals	form crystals	form crystalline	form solid
solubility water: soluble 35.8 g/L at 20 °C	solubility H₂O: 0.1 M at 20 °C, clear, colorless	solubility water: ~35.8 g/L at 20 °C	solubility 218 g/L
assay ≥99.0% (T)	assay ≥99.0% (T)	assay 98.5-102.5%	assay 99.0-102.0% (alkalimetric)
Quality Level 200	Quality Level 200	Quality Level 200	Quality Level 300
grade puriss. p.a.	grade -	grade -	grade -
pH 9.0-9.3 (25 °C, 50 mg/mL in H₂O)	pH 8.8-9.4 (25 °C, 0.1 M in H₂O)	pH -	pH 9.0-9.3 (20 °C, 50 g/L in H₂O)

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.[1]

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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