Revision as of 23:00, 26 December 2013 editUncle Milty (talk | contribs)Extended confirmed users, New page reviewers, Pending changes reviewers44,708 edits Reverted good faith edits by Tismark2 (talk): Revert original research. (TW)← Previous edit | Revision as of 19:22, 1 January 2014 edit undoSmokefoot (talk | contribs)Autopatrolled, Extended confirmed users, Pending changes reviewers, Rollbackers74,236 edits expand throughout, including defining the various hydrates, its production and its reactionsNext edit → | ||
Line 6: | Line 6: | ||
| ImageSize = 150px | | ImageSize = 150px | ||
| IUPACName = Sodium hydrogen phosphate | | IUPACName = Sodium hydrogen phosphate | ||
| OtherNames = Disodium hydrogen orthophosphate<br/>Sodium hydrogen phosphate<br/>Sodium phosphate dibasic<br/> |
| OtherNames = Disodium hydrogen orthophosphate<br/>Sodium hydrogen phosphate<br/>Sodium phosphate dibasic<br/>disodium phosphate | ||
| Section1 = {{Chembox Identifiers | | Section1 = {{Chembox Identifiers | ||
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | ||
Line 56: | Line 56: | ||
}} | }} | ||
'''Disodium hydrogen phosphate''' |
'''Disodium hydrogen phosphate''' is the ] with the formula Na<sub>2</sub>HPO<sub>4</sub>. It is one of several ] ]s of ]. The salt is known in anhydrous form as well as forms with 2, 7, 8, and 12 ]. All are water-soluble white powders; the anhydrous salt being ].<ref> </ref> | ||
==Other uses== | |||
*Disodium phosphate is used in ] to quicken cook time, and Jell-O Instant Pudding for thickening, as described on the ingredients panel of the product package. | |||
*Disodium phosphate is used in conjunction with ] in many steam-boiler applications. It supplies the inventory of free phosphates to retard calcium scale formation. | |||
⚫ | |||
==Preparation and basic properties== | |||
==Manufacturing== | |||
It is prepared in a two-step process by treating ] with phosphoric acid, which precipitates ]:<ref name=Ullmann>Klaus Schrödter, Gerhard Bettermann, Thomas Staffel, Friedrich Wahl, Thomas Klein, Thomas Hofmann "Phosphoric Acid and Phosphates" in ''Ullmann’s Encyclopedia of Industrial Chemistry'' 2008, Wiley-VCH, Weinheim. {{DOI|10.1002/14356007.a19_465.pub3}}</ref> | |||
Disodium monophosphate is produced from ] and ]. | |||
:CaHPO<sub>4</sub> + NaHSO<sub>4</sub> → NaH<sub>2</sub>PO<sub>4</sub> + CaSO<sub>4</sub> | |||
In the second step, the resulting solution of monosodium phosphate is partially neutralized: | |||
:NaH<sub>2</sub>PO<sub>4</sub> + NaOH → HNa<sub>2</sub>PO<sub>4</sub> + H<sub>2</sub>O | |||
The ] of disodium hydrogen phosphate water solution is between 8.0 and 11.0, meaning it is ]. | |||
Heating solid disodium phosphate gives the useful compound ]: | |||
:2 HNa<sub>2</sub>PO<sub>4</sub> → Na<sub>4</sub>P<sub>2</sub>O<sub>7</sub> + H<sub>2</sub>O | |||
==Uses== | |||
It is used as an in conjunction with ] in many steam-boiler applications. It retards calcium scale formation.anti-scale agent. It is also found in some detergents and cleaning agents.<ref name=Ullmann/> | |||
Its presence prevents coagulation in the preparation of condensed milk. Similarly, it is used as an anti-caking additive in powdered products.<ref> </ref> It is used in deserts and puddings, e.g. ] to quicken cook time, and Jell-O Instant Pudding for thickening. | |||
⚫ | Monobasic and dibasic sodium phosphate are used as a saline laxative to treat constipation or to clean the bowel before a colonoscopy.<ref>[http://wishardhealth.kramesonline.com/Medications/26,1558</ref> | ||
== References == | == References == |
Revision as of 19:22, 1 January 2014
Names | |
---|---|
IUPAC name Sodium hydrogen phosphate | |
Other names
Disodium hydrogen orthophosphate Sodium hydrogen phosphate Sodium phosphate dibasic disodium phosphate | |
Identifiers | |
CAS Number | |
3D model (JSmol) | |
ChEBI | |
ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.028.590 |
EC Number |
|
E number | E339(ii) (antioxidants, ...) |
PubChem CID | |
RTECS number |
|
UNII | |
CompTox Dashboard (EPA) | |
InChI
| |
SMILES
| |
Properties | |
Chemical formula | Na2HPO4 |
Molar mass | 141.96 g/mol (anhydrous) 268.07 g/mol (heptahydrate) |
Appearance | White crystalline solid |
Odor | odorless |
Density | 1.7 g/cm |
Melting point | 250 ºC decomp. |
Solubility in water | 7.7 g/100 ml (20 ºC) 11.8 g/100 mL (25 °C, heptahydrate) |
Acidity (pKa) | 12.35 |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards | Irritant |
NFPA 704 (fire diamond) | 1 0 0 |
Flash point | Non-flammable |
Related compounds | |
Other anions | sodium phosphite |
Other cations | Dipotassium phosphate Diammonium phosphate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). N verify (what is ?) Infobox references |
Disodium hydrogen phosphate is the inorganic compound with the formula Na2HPO4. It is one of several sodium salts of phosphoric acid. 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.
Preparation and basic properties
It is prepared in a two-step process by treating dicalcium phosphate with phosphoric acid, which precipitates calcium sulfate:
- CaHPO4 + NaHSO4 → NaH2PO4 + CaSO4
In the second step, the resulting solution of monosodium phosphate is partially neutralized:
- NaH2PO4 + NaOH → HNa2PO4 + H2O
The pH of disodium hydrogen phosphate water solution is between 8.0 and 11.0, meaning it is basic. Heating solid disodium phosphate gives the useful compound tetrasodium pyrophosphate:
- 2 HNa2PO4 → Na4P2O7 + H2O
Uses
It is used as an in conjunction with trisodium phosphate in many steam-boiler applications. It retards calcium scale formation.anti-scale agent. It is also found in some detergents and cleaning agents.
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 deserts and puddings, e.g. Cream of Wheat to quicken cook time, and Jell-O Instant Pudding for thickening.
Monobasic and dibasic sodium phosphate are used as a saline laxative to treat constipation or to clean the bowel before a colonoscopy.
References
- Physical data (pdf)
- ^ Klaus Schrödter, Gerhard Bettermann, Thomas Staffel, Friedrich Wahl, Thomas Klein, Thomas Hofmann "Phosphoric Acid and Phosphates" in Ullmann’s Encyclopedia of Industrial Chemistry 2008, Wiley-VCH, Weinheim. doi:10.1002/14356007.a19_465.pub3
- MSDS
- [http://wishardhealth.kramesonline.com/Medications/26,1558
Sodium compounds | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Inorganic |
| ||||||||||||||
Organic |
This inorganic compound–related article is a stub. You can help Misplaced Pages by expanding it. |