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Disodium hydrogen phosphate

Disodium phosphate
Structural formula of disodium phosphate
Ball-and-stick model of the component ions of disodium phosphate
Names
IUPAC name
Sodium hydrogen phosphate
Other names
Disodium hydrogen orthophosphate
Sodium hydrogen phosphate
Sodium phosphate dibasic
disodium phosphate
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.028.590
EC Number 231-448-7
PubChem CID
RTECS number WC4500000
UNII
Properties
Na2HPO4
Molar mass 141.96 g/mol (anhydrous)
268.07 g/mol (heptahydrate)
Appearance White crystalline solid
Odor odorless
Density 1.7 g/cm3
Melting point 250 °C (482 °F; 523 K) decomposes
7.7 g/100 ml (20 °C)
11.8 g/100 mL (25 °C, heptahydrate)
Solubility insoluble in alcohol
log P -5.8
Acidity (pKa) 12.35
−56.6·10−6 cm3/mol
1.35644..1.35717 at 20°C
Hazards
Main hazards Irritant
Safety data sheet ICSC 1129
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine 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
Lethal dose or concentration (LD, LC):
LD50 (median dose)
17000 mg/kg (rat, oral)
Related compounds
Other anions
sodium phosphite
Other cations
Dipotassium phosphate
Diammonium phosphate
Related compounds
Monosodium phosphate
Trisodium phosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Disodium phosphate (DSP), or sodium hydrogen phosphate, is the inorganic compound with the formula Na2HPO4. It is one of several sodium phosphates. The salt is known in anhydrous form as well as forms with 2, 7, 8, and 12 hydrates. All are water-soluble white powders; the anhydrous salt being hygroscopic.


The pH of disodium hydrogen phosphate water solution is between 8.0 and 11.0, meaning it is moderately basic:

It can be generated by neutralization of phosphoric acid with sodium hydroxide:

Industrially It is prepared in a two-step process by treating dicalcium phosphate with sodium bisulfate, which precipitates calcium sulfate:

In the second step, the resulting solution of monosodium phosphate is partially neutralized:

It is used in conjunction with trisodium phosphate in foods and water softening treatment. In foods, it is used to adjust pH. Its presence prevents coagulation in the preparation of condensed milk. Similarly, it is used as an anti-caking additive in powdered products. It is used in desserts and puddings, e.g. Cream of Wheat to quicken cook time, and Jell-O Instant Pudding for thickening. In water treatment, it retards calcium scale formation. It is also found in some detergents and cleaning agents.

Heating solid disodium phosphate gives the useful compound tetrasodium pyrophosphate:

Monobasic and dibasic sodium phosphate are used as a saline laxative to treat constipation or to clean the bowel before a colonoscopy.


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