Dipotassium phosphate

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Dipotassium phosphate
Di-potassium monohydrogen phosphate.svg
Hydrogenfosforečnan draselný.JPG
Identifiers
CAS number 7758-11-4 YesY
PubChem 24450
ChemSpider 22858 YesY
UNII CI71S98N1Z YesY
ChEMBL CHEMBL1200459 N
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
Flammability code 0: Will not burn. E.g., water Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point Non-flammable
Related compounds
Other cations Disodium phosphate
Diammonium phosphate
Related compounds Monopotassium phosphate
Tripotassium phosphate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Dipotassium phosphate (K2HPO4) (also 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.

A dipotassium phosphate solution is formed by the stoichiometric reaction of phosphoric acid with two equivalents of potassium hydroxide:

H3PO4 + 2 KOH → K2HPO4 + 2 H2O

Uses[edit]

As a food additive, potassium phosphate is used in imitation dairy creamers, dry powder beverages, mineral supplements, and starter cultures.[1] It is used in non-dairy creamers to prevent coagulation.[2]

Dipotassium phosphate is also used to make buffer solutions and it is used in the production of trypticase soy broth which is used to make agar plates for culturing bacteria.[citation needed]

Safety[edit]

As a food additive, dipotassium phosphate is categorized in the United States by the Food and Drug Administration as generally recognized as safe (GRAS).[3]

References[edit]

  1. ^ John H. Thorngate iii, Seppo Salminen , Larry A . Branen , and Michael P . Davidson, ed. (2001). "Food Phosphates". Food Additives. CRC Press. doi:10.1201/9780824741709.ch25. ISBN 978-0-8247-9343-2. 
  2. ^ "dipotassium phosphate". Retrieved 2009-01-06.  (uses: Food Industry)
  3. ^ "Database of Select Committee on GRAS Substances (SCOGS) Reviews". Retrieved 2008-03-22.  (listed as "potassium phosphate, dibasic")