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Sigma-Aldrich

di-Sodium hydrogen phosphate dihydrate

puriss. p.a., reag. Ph. Eur., 98.5-101.0% (calc. to the dried substance)

Synonym(s):

sec-Sodium phosphate, Disodium hydrogen phosphate dihydrate, Disodium phosphate, Sodium phosphate dibasic dihydrate

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About This Item

Linear Formula:
Na2HPO4 · 2H2O
CAS Number:
10028-24-7
Molecular Weight:
177.99
EC Number:
231-448-7
MDL number:
MFCD00149182
UNSPSC Code:
12352302
PubChem Substance ID:
329753513
NACRES:
NA.21

Agency

USP/NF
reag. Ph. Eur.

Quality Level

200

grade

puriss. p.a.

Assay

98.5-101.0% (calc. to the dried substance)

form

crystals

impurities

reducing impurities, complies
≤0.0005% heavy metals (as Pb)
≤0.001% total nitrogen (N)
≤0.5% NaH2PO4 (calc. to dried subst.)

loss

19.5-21.0% loss on drying, 130 °C

pH

9.0-9.2 (20 °C, 5%)

anion traces

chloride (Cl-): ≤10 mg/kg
sulfate (SO42-): ≤50 mg/kg

cation traces

As: ≤0.5 mg/kg
Fe: ≤5 mg/kg
K: ≤50 mg/kg

suitability

in accordance for appearance of solution

SMILES string

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

InChI

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

InChI key

KDQPSPMLNJTZAL-UHFFFAOYSA-L

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General description

Sodium phosphate dibasic dihydrate is a highly hygroscopic and water-soluble compound. It is used in water softeners, cleaners also as buffers in particular formulations.

Application

Sodium phosphate dibasic dihydrate is used:
  • In the synthesis of BiOCl/BiPO4 composites from bismuth nitrate pentahydrate and potassium chloride by the microwave-assisted hydrothermal method.
  • To prepare sodium phosphate buffer solution.
  • As a phosphorus source in the synthesis of Mg-doped hydroxyapatite nanoplates.

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificates of Analysis (COA)

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