Qhov sib txawv tseem ceeb ntawm glacial acetic acid thiab acetic anhydride yog glacial acetic acid yog cov ntsiab lus ntawm acetic acid, whereas acetic anhydride yog lub cev qhuav dej ntawm acetic acid.
Acetic acid yog cov organic compound uas muaj txiaj ntsig zoo hauv kev sib txawv ntawm cov organic synthesis. Nws tuaj yeem pom nyob rau hauv nws cov concentrated lossis ntshiab daim ntawv, uas yog hu ua glacial acetic acid. Nws kuj tuaj yeem pom hauv nws daim ntawv lub cev qhuav dej ua acetic anhydride.
YGlacial Acetic Acid yog dab tsi?
Glacial acetic acid yog cov ntsiab lus ntawm acetic acid. Acetic acid yog cov organic compound uas muaj cov tshuaj formula CH3COOH. Cov molar loj ntawm cov tshuaj no yog 60 g / mol, thaum lub npe IUPAC ntawm cov tshuaj no yog Ethanoic acid. Tsis tas li ntawd, nyob rau hauv chav tsev kub, glacial acetic acid yog cov kua tsis muaj xim uas muaj qaub saj. Peb tuaj yeem hu ua glacial acetic acid ua carboxylic acid vim muaj cov carboxylic acid pawg (-COOH).
Daim duab 01: Lub Thawv Dej Glacial Acetic Acid
Ntxiv mus, glacial acetic acid muaj cov ntxhiab tsw ntxhiab, uas zoo ib yam li tsw ntawm vinegar thiab muaj cov yam ntxwv qaub saj. Nws kuj yog ib qho tsis muaj zog acid vim nws dissociates ib feem nyob rau hauv ib tug aqueous tov, tso acetate anion thiab ib tug proton. Feem ntau, acetic acid muaj ib tug dissociable proton ib molecule. Txawm li cas los xij, glacial acid yog ib qho khaus khaus heev.
Glacial acetic acid yog ib qho yooj yim carboxylic acid; Qhov tseeb, nws yog qhov yooj yim thib ob carboxylic acid. Nyob rau hauv solid-state ntawm cov khoom no, cov molecules tsim chains ntawm molecules ntawm hydrogen bonding. Txawm li cas los xij, nyob rau theem vapor ntawm qhov sib xyaw no, nws tsim dimers (ob lub molecules txuas rau ib leeg ntawm hydrogen bonds). Txij li cov kua glacial acetic acid yog cov kuab tshuaj polar protic, nws yog miscible nrog ntau cov polar thiab nonpolar solvents.
Acetic Anhydride yog dab tsi?
Acetic anhydride yog cov organic compound uas muaj cov tshuaj formula (CH3CO) 2O. Nws tseem hu ua ethanoic anhydride. Peb tuaj yeem sau nws li ac2O. Acetic anhydride yog qhov yooj yim tshaj plaws ntawm cov anhydride sib xyaw ntawm carboxylic acid.
Daim duab 02: Cov Qauv Tshuaj ntawm Acetic Anhydride
Cov tshuaj no tau siv dav los ua reagent rau cov txheej txheem organic synthesis. Nws tshwm sim raws li cov kua tsis muaj xim uas muaj cov ntxhiab tsw muaj zog acetic acid. Cov ntxhiab tsw muaj zog no vim yog cov tshuaj tiv thaiv ntawm acetic anhydride thiab noo noo hauv huab cua.
Zoo ib yam li lwm cov tshuaj acid anhydride, acetic anhydride yog ib qho yooj yim compound uas muaj cov qauv nonplanar. Nws muaj qhov sib txuas ntawm pi uas tsim los ntawm lub hauv paus oxygen atom, uas muaj qhov tsis muaj zog resonance stabilization dua li dipole-dipole repulsion ntawm ob lub carbonyl oxygen atoms.
Peb tuaj yeem tsim acetic anhydride los ntawm cua sov potassium acetate nrog benzoyl chloride. Industrially, nws yog tsim los ntawm carbonylation ntawm methyl acetate. Txawm li cas los xij, vim nws tus nqi qis, cov chaw kuaj mob feem ntau tsis npaj acetic anhydride rau kev tshawb fawb siv; xwb, lawv yuav los ntawm lwm tus neeg muab khoom.
Qhov txawv ntawm Glacial Acetic Acid thiab Acetic Anhydride yog dab tsi?
Peb tuaj yeem pom acetic acid nyob rau hauv nws cov concentrated lossis ntshiab daim ntawv, uas yog hu ua glacial acetic acid. Peb kuj tuaj yeem pom nws hauv nws daim ntawv dehydrated li acetic anhydride. Qhov sib txawv tseem ceeb ntawm glacial acetic acid thiab acetic anhydride yog glacial acetic acid yog cov concentrated tshaj plaws ntawm acetic acid, whereas acetic anhydride yog lub cev qhuav dej ntawm acetic acid.
Cov ntawv qhia hauv qab no qhia qhov sib txawv ntawm glacial acetic acid thiab acetic anhydride hauv daim ntawv tabular rau ib sab sib piv
Summary – Glacial Acetic Acid vs Acetic Anhydride
Acetic acid yog cov organic compound uas muaj txiaj ntsig zoo hauv kev sib txawv ntawm cov organic synthesis. Qhov sib txawv tseem ceeb ntawm glacial acetic acid thiab acetic anhydride yog glacial acetic acid yog cov concentrated tshaj plaws ntawm acetic acid, whereas acetic anhydride yog lub cev qhuav dej ntawm acetic acid.
