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| | Alyson is the name people use to contact me and I believe it seems fairly good when you say it. Credit authorising is how she makes a living. Mississippi is the only place I've been residing in but I will have to move in a yr or two. I am really fond of to go to karaoke but I've been taking on new things lately.<br><br>My web blog: spirit messages; [http://afeen.fbho.net/v2/index.php?do=/profile-210/info/ Read Home], |
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| | verifiedrevid = 457118728
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| |ImageFile = Disodium hydrogen phosphate.png
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| | ImageSize = 150px
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| | IUPACName = Sodium hydrogen phosphate
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| | OtherNames = Disodium hydrogen orthophosphate<br/>Sodium hydrogen phosphate<br/>Sodium phosphate dibasic<br/>disodium phosphate
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| | Section1 = {{Chembox Identifiers
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| | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
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| | ChemSpiderID = 22625
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| | UNII_Ref = {{fdacite|correct|FDA}}
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| | UNII = 22ADO53M6F
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| | InChI = 1/2Na.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+1;/p-3
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| | ChEMBL_Ref = {{ebicite|correct|EBI}}
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| | ChEMBL = 1060
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| | ChEBI_Ref = {{ebicite|correct|EBI}}
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| | ChEBI = 34683
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| | SMILES = [Na+].[Na+].[O-]P([O-])([O-])=O
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| | InChIKey = BNIILDVGGAEEIG-DFZHHIFOAK
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| | StdInChI_Ref = {{stdinchicite|changed|chemspider}}
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| | StdInChIKey = BNIILDVGGAEEIG-UHFFFAOYSA-K
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| | StdInChI = 1S/2Na.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+1;/p-3
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| | StdInChIKey_Ref = {{stdinchicite|changed|chemspider}}
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| | CASNo = 7558-79-4
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| | CASNo_Ref = {{cascite|correct|CAS}}
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| | CASOther = <br/>10028-24-7 (dihydrate)<br/>7782-85-6 (heptahydrate)<br/>10039-32-4 (dodecahydrate)
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| | PubChem = 24203
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| | EINECS = 231-448-7
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| | RTECS = WC4500000
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| }}
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| | Section2 = {{Chembox Properties
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| | Formula = Na<sub>2</sub>HPO<sub>4</sub>
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| | MolarMass = 141.96 g/mol (anhydrous)<br/>268.07 g/mol (heptahydrate)
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| | Appearance = White crystalline solid
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| | Odor = odorless
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| | Density = 1.7 g/cm<sup>3</sup>
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| | MeltingPt = 250 °C decomp.
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| | Solubility = 7.7 g/100 ml (20 °C) <br> 11.8 g/100 mL (25 °C, heptahydrate)
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| | pKa = 12.35
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| }}
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| | Section7 = {{Chembox Hazards
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| | ExternalMSDS = [http://www.inchem.org/documents/icsc/icsc/eics1129.htm ICSC 1129]
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| | EUIndex = Not listed
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| | NFPA-H = 1
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| | NFPA-F = 0
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| | NFPA-R = 0
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| | MainHazards = Irritant
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| | FlashPt = Non-flammable
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| }}
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| | Section8 = {{Chembox Related
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| | OtherAnions = [[sodium phosphite]]
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| | OtherCations = [[Dipotassium phosphate]]<br/>[[Diammonium phosphate]]
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| | OtherCpds = [[Monosodium phosphate]]<br/>[[Trisodium phosphate]]
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| }}
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| '''Disodium hydrogen phosphate''' is the [[inorganic compound]] with the formula Na<sub>2</sub>HPO<sub>4</sub>. It is one of several [[sodium phosphates]]. The salt is known in anhydrous form as well as forms with 2, 7, 8, and 12 [[water of hydration|hydrates]]. All are water-soluble white powders; the anhydrous salt being [[hygroscopic]].<ref>[http://www.ffcr.or.jp/zaidan/FFCRHOME.nsf/7bd44c20b0dc562649256502001b65e9/916cae3da5a8a11b49256f320018877f/$FILE/D121.pdf Physical data (pdf)]</ref>
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| ==Acid-base properties==
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| The [[pH]] of disodium hydrogen phosphate water solution is between 8.0 and 11.0, meaning it is [[base (chemistry)|basic]]:
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| :HPO<sub>4</sub><sup>2-</sup> + H<sub>2</sub>O <math>\overrightarrow{\leftarrow}</math> H<sub>2</sub>PO<sub>4</sub><sup>-</sup> + OH<sup>-</sup>
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| ==Production and reactions==
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| It can be generated by neutralization of [[phosphoric acid]] with [[sodium hydroxide]]:
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| :H<sub>3</sub>PO<sub>4</sub><sup>2-</sup> + 2 NaOH → HNa<sub>2</sub>PO<sub>4</sub> + 2 H<sub>2</sub>O
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| Industrially It is prepared in a two-step process by treating [[dicalcium phosphate]] with phosphoric acid, which precipitates [[calcium sulfate]]:<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>
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| :CaHPO<sub>4</sub> + NaHSO<sub>4</sub> → NaH<sub>2</sub>PO<sub>4</sub> + CaSO<sub>4</sub>
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| In the second step, the resulting solution of monosodium phosphate is partially neutralized:
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| :NaH<sub>2</sub>PO<sub>4</sub> + NaOH → HNa<sub>2</sub>PO<sub>4</sub> + H<sub>2</sub>O
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| ==Uses==
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| It is used as an in conjunction with [[trisodium phosphate]] in foods and water 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.<ref>[http://www.sciencelab.com/msds.php?msdsId=9925023 MSDS]</ref> 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 [[Fouling|calcium scale formation]]. It is also found in some detergents and cleaning agents.<ref name=Ullmann/>
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| Heating solid disodium phosphate gives the useful compound [[tetrasodium pyrophosphate]]:
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| :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
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| 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>
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| == References ==
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| {{reflist}}
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| {{Sodium compounds}}
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| [[Category:Sodium compounds]]
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| [[Category:Phosphates]]
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| {{inorganic-compound-stub}}
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Alyson is the name people use to contact me and I believe it seems fairly good when you say it. Credit authorising is how she makes a living. Mississippi is the only place I've been residing in but I will have to move in a yr or two. I am really fond of to go to karaoke but I've been taking on new things lately.
My web blog: spirit messages; Read Home,