Dipotassium phosphate
| Dipotassium phosphate | |
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IUPAC name
Dipotassium hydrogen phosphate
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Other names
Potassium monohydrogen phosphate
Phosphoric acid dipotassium salt Potassium phosphate dibasic |
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| Identifiers | |
| CAS number | 7758-11-4  |
| PubChem | 24450 |
| 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 | 167 g/100 mL (20 °C) |
| Solubility | very soluble in alcohol |
| Hazards | |
| EU Index | Not listed |
| NFPA 704 |
 0
2
0
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| Flash point | Non-flammable |
| Related compounds | |
| Other cations | Disodium phosphate Diammonium phosphate |
| Related compounds | Monopotassium phosphate Tripotassium phosphate |
 (what is this?) (verify)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| 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 substances1. It is used in non-dairy creamers to prevent coagulation.2
It is sometimes sold as a food additive to help with headaches.3
References
- ^ "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)
- ^ "dipotassium phosphate". http://everything2.com/e2node/dipotassium%2520phosphate. Retrieved 2009-01-06. (uses: Food Industry)
- ^ "BoironUSA". http://www.boironusa.com/products.aspx?pageid=1&pcat=0&pcat2=0&prodid=96. Retrieved 2008-07-09.
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