| Revision as of 13:47, 5 December 2011 editBeetstra (talk | contribs)Edit filter managers, Administrators172,031 edits Saving copy of the {{chembox}} taken from revid 451776019 of page Potassium_benzoate for the Chem/Drugbox validation project (updated: ''). |
Latest revision as of 21:45, 21 November 2024 edit 78.2.231.21 (talk) Undid revision 1258831402 by 78.2.231.21 (talk)Tag: Undo |
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{{short description|Chemical compound}} |
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{{ambox | text = This page contains a copy of the infobox ({{tl|chembox}}) taken from revid of page ] with values updated to verified values.}} |
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| verifiedrevid = 451429773 |
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|ImageFile=Potassium benzoate.png |
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| verifiedrevid = 464211028 |
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|ImageFile1=Potassium benzoate.jpg |
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| ImageFile = Potassium benzoate.png |
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| ImageSize = 180px |
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|IUPACName=Potassium benzoate |
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| ImageFile1 = Potassium-benzoate-xtal-layer-b-3D-bs-17.png |
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|OtherNames=Benzoic acid, potassium salt |
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|Section1= {{Chembox Identifiers |
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| ImageFileL2 = Potassium-benzoate-xtal-packing-layers-3D-sf.png |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ImageFileR2 = Potassium benzoate.jpg |
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| ImageSizeR2 = 100px |
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| IUPACName = Potassium benzoate |
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| OtherNames = |
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| Section1 = {{Chembox Identifiers |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ChemSpiderID = 10921 |
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| ChemSpiderID = 10921 |
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| ChEMBL = 2105241 |
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| KEGG = D05576 |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| UNII_Ref = {{fdacite|correct|FDA}} |
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| UNII = 763YQN2K7K |
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| UNII = 763YQN2K7K |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo_Ref = {{cascite|correct|CAS}} |
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| CASNo = 582-25-2 |
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| CASNo = 582-25-2 |
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| PubChem = 11399 |
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| PubChem = 23661960 |
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| EINECS = 209-481-3 |
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| EINECS = 209-481-3 |
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| SMILES = .C(=O)c1ccccc1 |
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| SMILES = .C(=O)c1ccccc1 |
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|Section2= {{Chembox Properties |
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| Section2 = {{Chembox Properties |
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| C=7|H=5|K=1|O=2 |
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| C=7 | H=5 | K=1 | O=2 |
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| Appearance=White ] solid |
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| Appearance = White ] solid |
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| Odor = Odorless<ref name=MSDS/> |
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| Odor = Odorless<ref name=info /> |
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| Density= 1.5 g/cm<sup>3</sup> |
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| Density = 1.5 g/cm<sup>3</sup> |
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| MeltingPt= > 300 °C |
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| MeltingPt = >{{convert|300|C|F K}} |
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| BoilingPtC = |
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| BoilingPt= |
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| Solubility = 69.87 g/100 mL (17.5 °C)<br> 73.83 g/100 mL (25 °C)<br> 79 g/100 mL (33.3 °C)<br> 88.33 g/100 mL (50 °C)<ref name=sioc>{{cite book|last1 = Seidell|first1 = Atherton|last2 = Linke|first2 = William F.|year = 1952|title = Solubilities of Inorganic and Organic Compounds|publisher = Van Nostrand|url = https://books.google.com/books?id=k2e5AAAAIAAJ |accessdate = 2014-05-29}}</ref><ref name=info>{{cite web|url = http://www.emeraldmaterials.com/cms/kalama/fis_ftp.downloadPublicDoc?p_filename=POTBENZ_TDS_ENG.pdf&p_doc_type=TDS|title = Potassium Benzoate | publisher = Emerald Kalama Chemical |accessdate = 2014-06-02}}</ref> |
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| Solubility= 65 g/100 mL (20 °C)<ref name=MSDS></ref> |
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| SolubleOther = Soluble in ] <br> Slightly soluble in ] <br> Insoluble in ] |
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| SolubleOther = Soluble in ]<br> Slightly soluble in ]<br> Insoluble in ] |
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| Solvent = other solvents |
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|Section3= {{Chembox Hazards |
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| Section3 = {{Chembox Hazards |
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| Hazards_ref=<ref>{{cite web |title=Potassium benzoate |url=https://pubchem.ncbi.nlm.nih.gov/compound/23661960#section=GHS-Classification |website=pubchem.ncbi.nlm.nih.gov |language=en}}</ref> |
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| MainHazards= |
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| GHSPictograms = {{GHS07}} |
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| FlashPt= |
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| GHSSignalWord = Warning |
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| Autoignition= >{{convert|950|C|F}}<ref name=MSDS/> |
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| HPhrases = {{H-phrases|315|319}} |
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| PPhrases = {{P-phrases|264|280|302+352|305+351+338|332+313|337+313|362}} |
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| NFPA-H = 2 |
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| NFPA-F = 1 |
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| NFPA-R = 0 |
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| MainHazards = Low toxicity |
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| FlashPtC = |
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| AutoignitionPtC = 950 |
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'''Potassium benzoate''' ('''E212'''), the ] ] of ], is a food ] that inhibits the growth of ], ] and some ]. It works best in low-] products, below 4.5, where it exists as benzoic acid. |
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Acidic foods and beverages such as ] (]), sparkling drinks (]), ]s (]), and ] (]) may be preserved with potassium benzoate. It is approved for use in most countries including ], the ] and the ], where it is designated by the ] E212. |
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Potassium benzoate is also used in the whistle in many ].<ref> from Defense Technical Information Center; article- Potassium Benzoate for Pyrotechnic Whistling Compositions: Its Synthesis and Characterization as an Anhydrous Salt</ref> |
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== Synthesis== |
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One very common way to make potassium benzoate is by oxidizing ] to ] followed by a neutralization with ]:<ref>{{cite patent|country=US|number=3867439|pubdate=1975-02-18|title=Preparation of potassium benzoate|assign1=]|inventor1-last=Hills|inventor1-first=David J.}}</ref> |
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:{{chem2|C6H5COOH + KOH -> C6H5COOK + H2O}} |
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Another way to synthesize potassium benzoate in the lab setting is by ] ] with ]: |
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:{{chem2|C6H5COOCH3 + KOH -> C6H5COOK + CH3OH}} |
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== Reactions == |
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Potassium benzoate, like ], can be ] with a strong ] and heat: |
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:{{chem2|C6H5COOK + KOH -> C6H6 + K2CO3}} |
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== Mechanism of food preservation== |
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The ] of ] begins with the absorption of benzoic acid into the cell. If the ] changes to 5 or lower, the ] of ] through ] is decreased by 95%. |
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== Safety and health == |
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Potassium benzoate has low acute toxicity upon oral and dermal exposure.<ref>{{cite web | url = http://www.inchem.org/documents/sids/sids/benzoates.pdf | title = Benzoates | publisher = United Nations Environment Programme | access-date = 2015-04-30 | archive-date = 2018-03-07 | archive-url = https://web.archive.org/web/20180307233506/http://www.inchem.org/documents/sids/sids/benzoates.pdf | url-status = dead }}</ref> The Food Commission, which campaigns for safer, healthier food in the UK, describes potassium benzoate as "mildly irritant to the skin, eyes and mucous membranes".<ref>, ''The Food Magazine'', Issue 77, Food Commission UK</ref> |
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==Spectra== |
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===Carbon-13 NMR === |
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The ] shows 5 unique peaks. There are four peaks between 130-140 ppm from the carbon atoms in the benzene ring. There is an additional carbon peak around 178 ppm representing the carbon atom from the ].<ref name=SciFinder>] - Carbon-13 NMR Spectrum for 582-25-2</ref> |
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===Infrared spectrum === |
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The following are the main peaks in the ].<ref name=SciFinder/> |
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* 1610: C=O from ] |
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* 1580: C=C from ] ring |
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== See also == |
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* ] |
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* ] |
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==References== |
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{{reflist}} |
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{{DEFAULTSORT:Potassium Benzoate}} |
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] |
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] |
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] |
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] |
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] |