Dipotassium phosphate

Dipotassium phosphate
Identifiers
CAS number 7758-11-4 YesY
PubChem 24450
ChemSpider 22858 YesY
UNII CI71S98N1Z YesY
Jmol-3D images Image 1
Properties
Molecular formula K2HPO4
Molar mass 174.2 g/mol
Appearance white powder
deliquescent
Odor odorless
Density 2.44 g/cm3
Melting point

>465 °C decomp.

Solubility in water 149.25 g/100 mL (20 °C)
Solubility slightly soluble in alcohol
Acidity (pKa) 12.4
Basicity (pKb) 6.8
Hazards
EU Index Not listed
NFPA 704
NFPA 704.svg
0
2
0
Flash point Non-flammable
Related compounds
Other cations Disodium phosphate
Diammonium phosphate
Related compounds Monopotassium phosphate
Tripotassium phosphate
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Dipotassium phosphate (K2HPO4) - also phosphoric acid, dipotassium salt; dipotassium hydrogen orthophosphate; potassium phosphate, dibasic - is a highly water-soluble salt which is often used as a fertilizer, food additive and buffering agent. It is a common source of phosphorus and potassium.

The pH of a dipotassium phosphate solution is almost neutral. It is formed by the stoichiometric neutralization of phosphoric acid with potassium hydroxide:

H3PO4 + 2 KOH → K2HPO4 + 2 H2O

It reacts with phosphoric acid to generate monopotassium phosphate:

K2HPO4 + H3PO4 → 2 KH2PO4

Safety

As a food additive, Dipotassium phosphate is on the FDA's Generally recognized as safe, or GRAS, list of substances[1]. It is used in non-dairy creamers to prevent coagulation.[2]

References

  1. ^ "Database of Select Committee on GRAS Substances (SCOGS) Reviews". http://www.cfsan.fda.gov/~dms/opascogd.html. Retrieved 2008-03-22.  (listed as potassium phosphate, dibasic)
  2. ^ "dipotassium phosphate". http://everything2.com/e2node/dipotassium%2520phosphate. Retrieved 2009-01-06.  (uses: Food Industry)



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Look at other dictionaries:

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  • dibasic potassium phosphate — [USP] the dipotassium salt, K2HPO4; used alone or in combination with other phosphate compounds as an electrolyte replenisher, administered orally or intravenously. Called also dipotassium phosphate …   Medical dictionary

  • Diammonium phosphate — Diammonium phosphate[1] IUPAC name …   Wikipedia

  • Disodium phosphate — IUPAC name Sodium hydrogen phosphate …   Wikipedia

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