Wikipedia:WikiProject Chemicals/Chembox validation/VerifiedDataSandbox and Monosodium phosphate: Difference between pages

{{Chembox

| Verifiedfields = changed

| Watchedfields = changed

| verifiedrevid = 462253577

| ImageFile1 = monosodium phosphate.png

| ImageSize1 = 150px

| ImageFile2 = Sodium-dihydrogen-phosphate-3D-vdW.png

| ImageSize2 = 140px

| ImageCaption2 = {{legend|orange|Phosphorus, P}}{{legend|red|Oxygen, O}}{{legend|white|Hydrogen, H}}{{legend|rgb(160, 84, 232)|Sodium, Na}}

| ImageName2 = Ball-and-stick model of the dihydrogenphosphate anion

| ImageFile3 = Dihydrogenfosforečnan sodný.JPG

| OtherNames = {{ubl|Monobasic sodium phosphate|Sodium biphosphate}}

| CASNo = 7558-80-7

| CASNo_Ref = {{cascite|correct|CAS}}

| UNII_Ref = {{fdacite|changed|FDA}}

| UNII = KH7I04HPUU

| ChEMBL_Ref = {{ebicite|correct|EBI}}

| ChEMBL = 1368

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChEBI_Ref = {{ebicite|correct|EBI}}

| 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

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

}}

| Formula = {{chem2|NaH2PO4}}

| Na=1|H=2|P=1|O=4

| Appearance = White powder or crystals

| Density = 2.36 g/cm³ (anhydrous)

| MeltingPt =

| BoilingPt =

| Solubility = 59.90 g/(100 mL) (0°C)

}}

| Section7 = {{Chembox Hazards

| ExternalSDS =

| NFPA-H = 0

| NFPA-F = 0

| NFPA-R = 0

| MainHazards =

| FlashPt = Non-flammable

}}

| OtherAnions =

| OtherCations = {{ubl|[[Monopotassium phosphate]]|[[Monoammonium 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''_a]] of monosodium phosphate is 6.8-7.2 (depending on the [[Physical chemistry|physicochemical]] characteristics during p''K''_a 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]]