Tripotassium phosphate

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Tripotassium phosphate
Tripotassium phosphate.png
CAS number 7778-53-2 YesY
PubChem 62657
ChemSpider 56408 YesY
Jmol-3D images Image 1
Molecular formula K3PO4
Molar mass 212.27 g/mol
Appearance White deliquescent powder
Density 2.564 g/cm3 (17 °C)
Melting point 1,380 °C (2,520 °F; 1,650 K)
Solubility in water 90 g/100 mL (20 °C)
Solubility in ethanol Insoluble
Basicity (pKb) 1.6
EU Index Not listed
R-phrases R36-R38
S-phrases S26-S36
Main hazards Irritant
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 Trisodium phosphate
Triammonium phosphate
Tricalcium phosphate
Related compounds Monopotassium phosphate
Dipotassium phosphate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Tripotassium phosphate is a water-soluble ionic salt which has the chemical formula K3PO4. It is used as a food additive for its properties as an emulsifier, foaming agent, and whipping agent.[1] In combination with fatty acids, it is a potential antimicrobial agent in poultry processing.[2] As a fertilizer, its proportions of N, P2O5, and K2O are 0-33-67.


  1. ^ "NutritionData Food Additive Identifier". 
  2. ^ Hinton, Arthur; Ingram, Kimberly D. (July 2005). "Microbicidal Activity of Tripotassium Phosphate and Fatty Acids toward Spoilage and Pathogenic Bacteria Associated with Poultry". Journal of Food Protection (7): 1336–1534.