Dipotassium phosphate
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| Names | |
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IUPAC names
Potassium hydrogenphosphate
Potassium hydrogen(tetraoxidophosphate)(2−) |
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Systematic IUPAC name
Potassium hydroxidotrioxidophosphate(2−)
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| Other names
Potassium monohydrogen phosphate
Phosphoric acid dipotassium salt Potassium phosphate dibasic |
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| Identifiers | |
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3D model (Jmol)
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| ChEBI | |
| ChemSpider | |
| ECHA InfoCard | 100.028.940 |
| EC Number | 231-834-5 |
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PubChem CID
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| Properties | |
| K2HPO4 | |
| Molar mass | 174.2 g/mol |
| Appearance | white powder deliquescent |
| Odor | odorless |
| Density | 2.44 g/cm3 |
| Melting point | > 465 °C (869 °F; 738 K) decomposes |
| 149.25 g/100 mL (20 °C) | |
| Solubility | slightly soluble in alcohol |
| Acidity (pKa) | 12.4 |
| Basicity (pKb) | 6.8 |
| Hazards | |
| NFPA 704 | |
| Flash point | Non-flammable |
| Related compounds | |
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Other cations
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Disodium phosphate Diammonium phosphate |
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Related compounds
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Monopotassium phosphate Tripotassium phosphate |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 (what is   ?) |
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| 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:
As a food additive, dipotassium phosphate is used in imitation dairy creamers, dry powder beverages, mineral supplements, and starter cultures. It is used in non-dairy creamers to prevent coagulation.
Dipotassium phosphate is also used to make buffer solutions and it is used in the production of trypticase soy agar which is used to make agar plates for culturing bacteria.
A 3% gel of dipotassium phosphate is used as the active ingredient in Crest Sensi-Strips, a common tooth sensitivity product.
As a food additive, dipotassium phosphate is categorized in the United States by the Food and Drug Administration as generally recognized as safe (GRAS).
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