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| Names | |
|---|---|
| IUPAC name Potassium hydrogen phosphate | |
| Other names Potassium monohydrogen phosphate Phosphoric acid dipotassium salt Potassium phosphate dibasic | |
| Identifiers | |
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3D model (JSmol) | |
| ChEBI | |
| ChEMBL | |
| ChemSpider |
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| ECHA InfoCard | 100.028.940 |
| EC Number |
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| E number | E340(ii)(antioxidants, ...) |
| UNII |
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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 inalcohol |
| Acidity (pKa) | 12.4 |
| Basicity (pKb) | 6.8 |
| Hazards | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Related compounds | |
Othercations | Disodium phosphate Diammonium phosphate |
Related compounds | Monopotassium phosphate Tripotassium phosphate |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Dipotassium phosphate (alsodipotassium hydrogen orthophosphate orpotassium phosphate dibasic) is theinorganic compound with the formula K2HPO4.(H2O)x (x = 0, 3, 6). Together withmonopotassium phosphate (KH2PO4.(H2O)x), it is often used as afertilizer,food additive, andbuffering agent.[1] It is a white or colorless solid that is soluble in water.
It is produced commercially by partial neutralization ofphosphoric acid with two equivalents ofpotassium chloride:[1]
As a food additive, dipotassium phosphate is used inimitation dairy creamers, dry powder beverages, mineral supplements, and starter cultures.[2] It functions as an emulsifier, stabilizer and texturizer; it is also a buffering agent, and chelating agent especially for the calcium in milk products.[3]
As afood additive, dipotassium phosphate isgenerally recognized as safe by the United StatesFood and Drug Administration,[4] and is commonly used (in conjunction with other inorganic salts) to add taste to some brands ofbottled water.[5]
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