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Saving copy of the {{chembox}} taken from revid 444018318 of page Monosodium_phosphate for the Chem/Drugbox validation project (updated: 'ChEMBL').
 
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{{Chembox
{{ambox | text = This page contains a copy of the infobox ({{tl|chembox}}) taken from revid [{{fullurl:Monosodium_phosphate|oldid=444018318}} 444018318] of page [[Monosodium_phosphate]] with values updated to verified values.}}
| Verifiedfields = changed
{{chembox
| Watchedfields = changed
| verifiedrevid = 444017251
| verifiedrevid = 462253577
| ImageFile = monosodium phosphate.png
| ImageFile1 = monosodium phosphate.png
| ImageSize = 150px
| ImageSize1 = 150px
| ImageFileL1 = 2-dihydrogenphosphate-3D-balls.png
| ImageFile2 = Sodium-dihydrogen-phosphate-3D-vdW.png
| ImageSizeL1 = 140
| ImageSize2 = 140px
| ImageNameL1 = Ball-and-stick model of the dihydrogenphosphate anion
| ImageCaption2 = {{legend|orange|Phosphorus, P}}{{legend|red|Oxygen, O}}{{legend|white|Hydrogen, H}}{{legend|rgb(160, 84, 232)|Sodium, Na}}
| ImageFileR1 = Sodium-3D.png
| ImageName2 = Ball-and-stick model of the dihydrogenphosphate anion
| ImageSizeR1 = 90
| ImageFile3 = Dihydrogenfosforečnan sodný.JPG
| ImageNameR1 = The sodium cation
| ImageFile2 = Dihydrogenfosforečnan sodný.JPG
| IUPACName = Sodium dihydrogen phosphate
| IUPACName = Sodium dihydrogen phosphate
| OtherNames = {{ubl|Monobasic sodium phosphate|Sodium biphosphate}}
| OtherNames =
| Section1 = {{Chembox Identifiers
| Section1 = {{Chembox Identifiers
| CASNo= 7558-80-7
| CASNo = 7558-80-7
| CASNo_Ref = {{cascite|correct|CAS}}
| CASNo_Ref = {{cascite|correct|CAS}}
| UNII_Ref = {{fdacite|changed|FDA}}
| ChEMBL = 1368
| UNII = KH7I04HPUU
| ChEMBL_Ref = {{ebicite|correct|EBI}}
| ChEMBL = 1368
| PubChem = 24204
| PubChem = 24204
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 22626
| ChemSpiderID = 22626
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI = 37585
| ChEBI = 37585
| SMILES = [Na+].[O-]P(=O)(O)O
| SMILES = [Na+].[O-]P(=O)(O)O
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI=1S/Na.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+1;/p-1
| StdInChI = 1S/Na.H3O4P/c;1-5(2,3)4/h;(H3,1,2,3,4)/q+1;/p-1
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = AJPJDKMHJJGVTQ-UHFFFAOYSA-M
| StdInChIKey = AJPJDKMHJJGVTQ-UHFFFAOYSA-M
}}
}}
| Section2 = {{Chembox Properties
| Section2 = {{Chembox Properties
| Formula = NaH<sub>2</sub>PO<sub>4</sub>
| Formula = {{chem2|NaH2PO4}}
| Na=1|H=2|P=1|O=4
| MolarMass = 119.98 g/mol
| Appearance = White powder or crystals
| Appearance = White powder or crystals
| Density =
| Density = 2.36 g/cm<sup>3</sup> (anhydrous)
| MeltingPt =
| MeltingPt =
| BoilingPt =
| BoilingPt =
| Solubility = 59.9 g/100 mL (0°C)
| Solubility = 59.90 g/(100 mL) (0°C)
}}
}}
| Section3 = {{Chembox Hazards
| Section7 = {{Chembox Hazards
| ExternalMSDS =
| ExternalSDS =
| EUIndex = Not listed
| NFPA-H = 0
| NFPA-H = 1
| NFPA-F = 0
| NFPA-F = 0
| NFPA-R = 0
| NFPA-R = 0
| MainHazards =
| FlashPt = Non-flammable
| MainHazards =
}}
| FlashPt = Non-flammable
}}
| Section8 = {{Chembox Related
| Section8 = {{Chembox Related
| OtherAnions =
| OtherAnions =
| OtherCations = [[Monopotassium phosphate]]<br/>[[Monoammonium phosphate]]
| OtherCations = {{ubl|[[Monopotassium phosphate]]|[[Monoammonium phosphate]]}}
| OtherCpds = [[Disodium phosphate]]<br/>[[Trisodium phosphate]]
| OtherCompounds = {{ubl|[[Disodium phosphate]]|[[Trisodium phosphate]]}}
}}
}}
}}
}}
'''Monosodium phosphate''' ('''MSP'''), also known as '''monobasic sodium phosphate''' and '''sodium dihydrogen phosphate''', is an [[inorganic compound]] with the [[chemical formula]] {{chem2|NaH2PO4|auto=1}}. It is a [[sodium]] [[Salt (chemistry)|salt]] of [[phosphoric acid]]. It consists of sodium [[cations]] ({{chem2|Na+}}) and [[dihydrogen phosphate]] [[anions]] ({{chem2|H2PO4−}}). One of many [[sodium phosphates]], it is a common [[chemical industry|industrial chemical]]. The salt exists in an [[anhydrous]] form, as well as [[hydrate|monohydrate and dihydrate]] ({{chem2|NaH2PO4*H2O}} and {{chem2|NaH2PO4*2H2O}} respectively).<ref name=Ullmann>{{Ullmann|first1=Klaus|last1=Schrödter|first2=Gerhard|last2=Bettermann|first3=Thomas |last3=Staffel|first4=Friedrich|last4=Wahl|first5=Thomas|last5=Klein||first6=Thomas|last6=Hofmann|title=Phosphoric Acid and Phosphates|year=2008|doi=10.1002/14356007.a19_465.pub3}}</ref>

==Production and reactions==
The salt is obtained by partial neutralization of [[phosphoric acid]]. The [[pKa|p''K''<sub>a</sub>]] of monosodium phosphate is 6.8-7.2 (depending on the [[Physical chemistry|physicochemical]] characteristics during p''K''<sub>a</sub> determination).<ref>Salaun, F.: [http://www.prodinra.inra.fr/prodinra/pinra/data/2008/04/PROD2008990fa814_20080417115100287.pdf "Influence of mineral environment on the buffering capacity of casein micelles"] {{Webarchive|url=https://web.archive.org/web/20120313062736/http://www.prodinra.inra.fr/prodinra/pinra/data/2008/04/PROD2008990fa814_20080417115100287.pdf |date=2012-03-13}}, "Milchwissenschaft", 62(1):3</ref>

Heating this salt above 169&nbsp;°C gives [[disodium pyrophosphate]]:
:{{chem2|2 NaH2PO4 → Na2H2P2O7 + H2O}}

When heated at 550&nbsp;°C, [[anhydrous]] [[trisodium trimetaphosphate]] is formed:<ref>{{cite book |doi=10.1002/9780470132340.ch26|chapter=Sodium Metaphosphates |year=1950 |last1=Bell |first1=R. N. |title=Inorganic Syntheses |pages=103–106 |isbn=9780470132340|volume=3}}</ref>
:{{chem2|3 NaH2PO4 → Na3P3O9 + 3 H2O}}

==Uses==
Phosphates are often used in foods and in water treatment. The [[pH]] of such formulations is generally adjusted by mixtures of various [[sodium phosphates]], such as this salt.<ref name=Ullmann/>
The [[sodium chloride]] equivalent value, or E-Value, is 0.49.{{cln|reason=What is "E-value"??? Please clear this jargon for an average mortal human being!|date=December 2023}} It is soluble in 4.5 parts water.{{cln|reason=What on this Earth is "parts water"??? Please clear this jargon for an average mortal human being! Define this ambiguous unit of measurement in terms of the SI units!|date=December 2023}}

===Food additive===
It is added in [[animal feed]], [[toothpaste]], and [[evaporated milk]]. It is used as a [[thickening agent]] and [[emulsifier]].

===Detection of magnesium===
Monosodium phosphate is used to detect the presence of [[magnesium]] [[ions]] in [[Salt (chemistry)|salts]]. Formation of a white precipitate on the addition of [[ammonium chloride]], [[ammonium hydroxide]] and monosodium phosphate to an [[aqueous]] or dilute [[Hydrogen chloride|HCl]] solution of the salt indicates presence of magnesium ions.

==Notes==
{{reflist}}

{{Sodium compounds}}
{{Phosphates}}
{{Mineral supplements}}

[[Category:Phosphates]]
[[Category:Sodium compounds]]
[[Category:Edible thickening agents]]