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Disodium phosphate

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Disodium phosphate
Names
IUPAC name Sodium hydrogen phosphate
Other names Disodium hydrogen orthophosphate
Sodium hydrogen phosphate
Sodium phosphate dibasic
di-Sodium Phosphate
Identifiers
CAS Number
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.028.590 Edit this at Wikidata
EC Number
  • 231-448-7
E number E339(ii) (antioxidants, ...)
PubChem CID
RTECS number
  • WC4500000
UNII
CompTox Dashboard (EPA)
InChI
  • InChI=1S/2Na.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+1;/p-3Key: BNIILDVGGAEEIG-UHFFFAOYSA-K
  • InChI=1/2Na.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+1;/p-3Key: BNIILDVGGAEEIG-DFZHHIFOAK
SMILES
  • ..P()()=O
Properties
Chemical formula Na2HPO4
Molar mass 141.96 g/mol (anhydrous)
268.07 g/mol (heptahydrate)
Appearance White crystalline solid
Odor odorless
Density 1.7 g/cm
Melting point 250 ºC decomp.
Solubility in water 7.7 g/100 ml (20 ºC)
11.8 g/100 mL (25 °C, heptahydrate)
Acidity (pKa) 12.35
Hazards
Occupational safety and health (OHS/OSH):
Main hazards Irritant
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1 0 0
Flash point Non-flammable
Related compounds
Other anions sodium phosphite
Other cations Dipotassium phosphate
Diammonium phosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

Disodium hydrogen phosphate (Na2HPO4) is a sodium salt of phosphoric acid. It is a white powder that is highly hygroscopic and water soluble. It is therefore used commercially as an anti-caking additive in powdered products. It is also known as disodium hydrogen orthophosphate, sodium hydrogen phosphate or sodium phosphate dibasic. It is commercially available in both the hydrated and anhydrous forms. pH of disodium hydrogen phosphate water solution is between 8.0 and 11.0, meaning it is basic.

Other uses

  • Disodium phosphate is used in Cream of Wheat to quicken cook time, and Jell-O Instant Pudding for thickening, as described on the ingredients panel of the product package.
  • Disodium phosphate is used in conjunction with trisodium phosphate in many steam-boiler applications. It supplies the inventory of free phosphates to retard calcium scale formation.
  • Monobasic and dibasic sodium phosphate is used as a saline laxative to treat constipation or to clean the bowel before a colonoscopy.

Manufacturing

Disodium monophosphate is produced from phosphoric acid and sodium carbonate.

References

  1. Physical data (pdf)
  2. MSDS
Sodium compounds
Inorganic
Halides
Chalcogenides
Pnictogenides
Oxyhalides
Oxychalcogenides
Oxypnictogenides
Others
Organic
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