Qhov txawv ntawm citric acid thiab acetic acid yog citric acid muaj peb pawg carboxylic acid, whereas acetic acid muaj ib pawg carboxylic acid.
Ob lub citric acid thiab acetic acid yog cov organic carboxylic acid compounds uas muaj cov carboxylic acid functional pawg (-COOH). Txawm li cas los xij, lawv txawv ntawm ib leeg raws li tus naj npawb ntawm pawg carboxylic acid hauv cov molecules.
Citric Acid yog dab tsi?
Citric acid yog cov organic compound uas muaj cov tshuaj formula HOC (COOH). Nws yog xim tsis muaj zog organic acid thiab ib txwm tshwm sim hauv cov txiv hmab txiv ntoo citrus. Hauv cov ntsiab lus biochemical, citric acid yog qhov nruab nrab hauv lub voj voog citric acid thaum lub sij hawm metabolism ntawm tag nrho cov kab mob aerobic. Feem ntau, kwv yees li 2 lab tons ntawm citric acid yog tsim txhua xyoo. Cov tshuaj no yog dav dav raws li ib tug acidifier thiab raws li ib tug flavoring neeg sawv cev. Nws kuj tseem ceeb raws li tus neeg sawv cev chelate.
Cov molar loj ntawm cov tshuaj no yog 192 g / mol hauv nws lub xeev tsis muaj dej. Thaum cais tawm, citric acid zoo li cov khoom dawb uas tsis muaj ntxhiab tsw. Qhov ceev ntawm daim ntawv anhydrous yog li 1.66 g / cm3. Nws cov ntsiab lus melting yog 156 degrees Celsius, thiab nws qhov kub ntawm 310 degrees Celsius. Txawm li cas los xij, nws pib decompose ntawm li 175 degrees Celsius. Ntxiv mus, citric acid yog soluble nyob rau hauv acetone, cawv, ether, ethyl acetate, tab sis nws yog insoluble nyob rau hauv toluene. Cov qauv siv lead ua ntawm cov khoom citric acid yog monoclinic.
Daim duab 01: Citrus Fruits
Feem ntau, cov kua qaub no tuaj yeem pom muaj ntau yam txiv hmab txiv ntoo thiab zaub, tab sis feem ntau yog cov txiv hmab txiv ntoo citrus. Piv txwv li, txiv qaub thiab txiv qaub muaj cov ntsiab lus siab ntawm citric acid. Thaum kev lag luam npaj cov tshuaj no, nws yog thawj zaug ua tiav los ntawm kev kho cov kua txiv hmab txiv ntoo nrog hydrated txiv qaub (calcium hydroxide) kom tau txais cov hmoov av ntawm calcium citrate, uas tau muab cais tawm thiab hloov rov qab rau citric acid siv sulfuric acid. Txawm li cas los xij, hauv kev lag luam niaj hnub no, citric acid yog npaj los ntawm cov txheej txheem fungal fermentation.
YAcetic Acid yog dab tsi?
Acetic acid yog cov organic compound uas muaj cov tshuaj formula CH3COOH. Nws tseem hu ua ethanoic acid thiab tshwm sim raws li cov kua qaub, tsis muaj xim uas muaj cov ntxhiab tsw zoo li vinegar. Cov molar loj ntawm cov tshuaj no yog 60 g / mol. Qhov ceev tuaj yeem muab tau li 1.05 g / cm3. Lub melting point yog li ntawm 61 mus rau 62 degrees Celsius, thiab lub boiling point ntawm 118 mus rau 119 degrees Celsius. Nws yog miscible nrog dej.
Peb tuaj yeem hais acetic acid yog qhov yooj yim thib ob carboxylic acid vim nws muaj ib pawg carboxylic acid ua haujlwm txuas nrog cov pa roj carbon atom. (Qhov yooj yim tshaj plaws carboxylic acid yog formic acid - HCOOH, pawg carboxylic acid tsis txuas nrog cov pa roj carbon atom). Acetic acid yog ib qho tseem ceeb hauv ntau qhov kev lag luam, xws li kev tsim cov cellulose acetate, polyvinyl acetate, hluavtaws fibers, thiab lwm yam. Hauv kev lag luam khoom noj khoom haus, cov tshuaj no muaj txiaj ntsig zoo li cov khoom noj khoom haus ntxiv nrog E tooj E260.
Daim duab 02: Dimers ntawm Acetic Acid nyob rau theem Vapor
Cov pab pawg carboxylic acid ua haujlwm hauv acetic acid molecule tuaj yeem dhau los ua ib feem ionization los ua acetate ion thiab hydrogen cation (proton). Tso cov proton no ua rau cov kua qaub ntawm acetic acid. Yog li ntawd, peb tuaj yeem hu cov tshuaj no ua ib qho tsis muaj zog monoprotic acid (uas txhais tau hais tias nws ib nrab dissociates thiab muab ib tug proton ib molecule). Feem ntau, cov khoom acetic acid muaj chains ntawm molecules, thiab cov molecules yog interconnected los ntawm hydrogen bonding. Nyob rau hauv nws cov theem vapor, peb tuaj yeem ntes dimers ntawm acetic acid molecules. Hauv nws lub xeev ua kua, nws yog hydrophilic polar protic hnyav.
Qhov txawv ntawm Citric Acid thiab Acetic Acid yog dab tsi?
Citric acid thiab acetic acid yog cov organic tebchaw uas muaj carboxylic acid ua haujlwm. Ob lub tebchaw no sib txawv ntawm ib leeg raws li tus naj npawb ntawm cov pab pawg ua haujlwm ntawm ib lub molecule thiab, yog li, lawv cov khoom siv tshuaj thiab lub cev. Qhov sib txawv tseem ceeb ntawm citric acid thiab acetic acid yog citric acid muaj peb pawg carboxylic acid, whereas acetic acid muaj ib pawg carboxylic acid.
Summary – Citric Acid vs Acetic Acid
Cov pawg carboxylic acid ua haujlwm muaj cov tshuaj formula -COOH. Citric acid thiab acetic acid muaj cov pab pawg ua haujlwm no hauv lawv cov molecules. Qhov sib txawv tseem ceeb ntawm citric acid thiab acetic acid yog citric acid muaj peb pawg carboxylic acid, whereas acetic acid muaj ib pawg carboxylic acid.
