Acetic Acid vs Vinegar
Acetic acid belongs rau tsev neeg ntawm cov organic tebchaw hu ua carboxylic acids. Lawv muaj pab pawg ua haujlwm -COOH. Cov pab pawg no hu ua pawg carboxyl. Carboxylic acid muaj cov qauv dav dav raws li hauv qab no.
Nyob hauv hom yooj yim tshaj plaws ntawm carboxylic acid, R pawg sib npaug rau H. Cov carboxylic acid no hu ua formic acid. Txawm hais tias formic acid, muaj ntau ntau hom carboxylic acids nrog ntau pawg R. Cov pab pawg R tuaj yeem yog cov saw hlau ncaj nraim, cov saw caj dab, pawg muaj ntxhiab, thiab lwm yam. Acetic acid, hexanoic acid, benzoic acid, yog qee qhov piv txwv rau carboxylic acids.
Acetic acid
Acetic acid yog carboxylic acid qhov twg R pawg ntawm cov qauv saum toj no yog -CH 3 Hauv IUPAC nomenclature, carboxylic acids muaj npe los ntawm kev poob qhov kawg - e ntawm lub npe. Lub npe ntawm alkane sib raug rau cov saw ntev tshaj plaws hauv cov kua qaub thiab ntxiv -oic acid. Ib txwm, cov carboxyl carbon tau muab tus lej 1. Raws li qhov no, IUPAC lub npe rau acetic acid yog ethanoic acid. Yog li acetic acid yog lub npe nrov ntawm nws.
Raws li lub npe hais tias nws yog cov kua qaub, yog li tuaj yeem pub cov hydrogen ion rau hauv cov tshuaj. Nws yog monoprotic acid. Nws yog cov kua uas tsis muaj xim nrog cov qaub saj thiab cov yam ntxwv tsw. Acetic acid yog ib qho polar molecule. Vim yog pawg -OH, lawv tuaj yeem tsim muaj zog hydrogen bonds nrog ib leeg thiab nrog dej. Raws li qhov tshwm sim, acetic acid muaj qhov kub kub uas yog li 119 ° C. Acetic acid yooj yim yaj hauv dej. Txij li nws yog carboxylic acid, nws dhau los ua txhua yam kev cuam tshuam ntawm carboxylic acids. Txij li thaum lawv yog acidic, lawv teb tau yooj yim nrog NaOH thiab NaHCO 3 cov kev daws teeb meem los tsim cov ntsev ntsev. Acetic acid yog ib qho tsis muaj zog acid, thiab nws muaj nyob rau hauv qhov sib npaug nrog nws cov conjugate puag (acetate ion) hauv aqueous media. Acetic acid yog cov khoom tseem ceeb hauv vinegar, uas yog siv rau hauv kev ua zaub mov. Nws yog siv los ua cov kuab tshuaj polar los npaj cov kuab tshuaj. Nws kuj yog siv los ua tshuaj reagent los ua ke cov tebchaw. Piv txwv li, nws yog siv nrog cawv los tsim ib qho ester
Acetic acid yog ib txwm ua los ntawm anaerobic fermentation siv qab zib substrates. Qhov no yog ua los ntawm cov kab mob anaerobic. Txoj kev tseem ceeb ntawm kev tsim cov acetic acid yog los ntawm txoj kev methanol carbonylation.
Vinegar
Qhov no yog kua uas muaj acetic acid thiab dej. Vinegar yog tsim los ntawm fermentation ntawm carbohydrate los ntawm microorganisms. Ntau yam ntawm cov substrates tuaj yeem raug coj los ua vinegar. M alt, txiv maj phaub, mov, xibtes, cane, npias, cawv, kua cider yog qee yam ntawm cov ntawd. Ntuj vinegar yog tsim los ntawm cov txheej txheem qeeb, uas yuav siv sij hawm ntau lub lis piam lossis ntau lub hlis, tab sis kuj tseem muaj cov kua txiv hmab txiv ntoo hauv kev ua lag luam niaj hnub no. Rau kev lag luam, cov txheej txheem fermentation tuaj yeem ua kom nrawm. Vinegar yog siv rau ntau lub hom phiaj. Feem ntau nws yog siv rau kev npaj zaub mov. Nws kuj tseem siv tau los ua tshuaj tua kab mob. Ntxiv vinegar yog siv rau kev kho mob lub hom phiaj xws li kev noj haus thiab kev tswj ntshav qab zib, raws li ib tug antimicrobial neeg sawv cev, thiab lwm yam.
Qhov txawv ntawm Acetic Acid thiab Vinegar yog dab tsi?
• Vinegar muaj acetic acid thiab dej.
• Yog li ntawd, me ntsis diluted acetic acid muaj nyob rau hauv vinegar.
• Lwm yam tshaj li acetic acid, ntuj vinegar tej zaum yuav muaj lwm cov tebchaw xws li citric acid, tartaric acid, thiab lwm yam.
