Video: Yuav ua li cas yog ib qho ester?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
Esters yog tsim los ntawm kev sib xyaw ua ke ntawm cov cawv thiab cov carboxylic acid. Hauv cov tshuaj tiv thaiv condensation, ob lub molecules koom nrog thiab tsim cov molecule loj dua thaum tshem tawm ib qho me me molecule. Thaum lub sij hawm esterification no me me molecule yog dej. Esters muaj cov yam ntxwv ntxhiab thiab tsis yaj hauv dej.
Ua kom pom qhov no, yuav ua li cas ib qho ester?
Esters yog tsim thaum cov carboxylic acid tau rhaub nrog cawv thaum muaj cov tshuaj tiv thaiv. Txoj hauv kev ntawm cov tshuaj tiv thaiv no hu ua Esterification Kev tshwm sim. Qhov no yog thim rov qab thiab qeeb cov tshuaj tiv thaiv. Thaum cov carboxylic acid ntxiv nrog catalyst thiab cawv, ib ester yog tsim nrog dej.
Ib sab saum toj no, kev siv tshuaj ester yog dab tsi? Cov no thiab lwm yam kev hloov pauv esters nrog cov yam ntxwv tsw yog siv nyob rau hauv hluavtaws tsw, perfumes, thiab tshuaj pleev ib ce. Qee yam tsis hloov pauv cov esters yog siv los ua cov kuab tshuaj rau lacquers, xim, thiab varnishes; Rau lub hom phiaj no, ntau qhov ntau ntawm ethyl acetate thiab butyl acetate yog ua lag luam.
Ib tus kuj tseem yuav nug tau, koj yuav ua li cas thiaj paub tias tus ester tau tsim?
Ib txoj hauv kev yooj yim txhawm rau txheeb xyuas qhov hnov tsw ntawm ester yog ncuav sib tov rau hauv ib co dej nyob rau hauv ib tug me me beaker. Sib nrug los ntawm qhov me me, esters tsis haum rau hauv dej thiab zoo li daim ntawv ib txheej nyias nyias ntawm qhov chaw. Ntau cov kua qaub thiab cawv ob qho tib si yaj thiab raug kaw kom zoo nyob hauv qab ester txheej
Qhov piv txwv ntawm ester yog dab tsi?
Piv txwv ntawm Esters Cov hydrogen ntawm pawg carboxyl ntawm acetic acid yog hloov nrog ib pawg ethyl. Lwm yam piv txwv ntawm esters suav nrog ethyl propanoate, propyl methanoate, propyl ethanoate, thiab methyl butanoate.
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