| Disodium phosphate | |
|---|---|
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| IUPAC name |
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| Other names | Disodium hydrogen orthophosphate Sodium hydrogen phosphate Sodium phosphate dibasic |
| Identifiers | |
| CAS number | [], 10028-24-7 (dihydrate) 7782-85-6 (heptahydrate) 10039-32-4 (dodecahydrate) |
| EC number | |
| RTECS number | WC4500000 |
| Properties | |
| Molecular formula | Na2HPO4 |
| Molar mass | 141.96 g/mol |
| Appearance | White crystalline solid |
| Density | 0.5–1.2 g/cm3 |
| Melting point |
250 ºC decomp. |
| Solubility in water | 7.7 g/100 ml (20 ºC) |
| Hazards | |
| MSDS | ICSC 1129 |
| EU Index | Not listed |
| Main hazards | Irritant |
| Flash point | Non-flammable |
| Related compounds | |
| Other cations | Dipotassium phosphate Diammonium phosphate |
| Related compounds | Monosodium phosphate Trisodium phosphate |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references |
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Disodium hydrogen phosphate (Na2HPO4) is a sodium salt of phosphoric acid. It is a white powder that is highly hygroscopic and water soluble.[1] It is therefore used commercially as an anti-caking additive in powdered products. It is also known as disodium hydrogen orthophosphate, sodium hydrogen phosphate or sodium phosphate dibasic. It is commercially available in both the hydrated and anhydrous forms.[2]
Other uses
- Disodium phosphate can be used in cream of wheat to quicken cook time, as described on the ingredients panel of the product package.
- Disodium phosphate is used in conjunction with trisodium phosphate in many steam boiler applications. It supplies the inventory of free phosphates to retard calcium scale formation.
References
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