Video: Dab tsi yog hom hnyav tshaj plaws rau recrystallization?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
Rau cov organic solutes, feem ntau yog qhov hnyav tshaj plaws rau recrystallization yog ethyl cawv.
Tsis tas li, cov kuab tshuaj twg zoo tshaj rau rov ua dua tshiab?
Tsis yog rov zoo!
| Ntau-ncov qaumteb qabteb hnyav | peb. (C) | Tsawg-polar hnyav |
|---|---|---|
| Ethanol | 78 | Hexane |
| Ethyl acetate | 77 | Cyclohexane |
| Ethanol | 78 | Acetone |
| Chloroform | 61 | Petroleum ether |
Ib yam nkaus, dab tsi yog qhov zoo tshaj recrystallization hnyav rau benzoic acid? Dej tau rov qab los ntawm 90% thiab methanol tau rov zoo li ntawm 64%. Dej Hauv qhov no yog qhov hnyav dua rau benzoic acid. Qhov no muaj tseeb vim yog qhov ua tau solubility. Dab tsi ua rau cov kuab tshuaj zoo rau rov ua dua tshiab yog tias cov tshuaj tsis yaj thaum cov kuab tshuaj txias tab sis tsuas yog thaum nws kub.
Tsis tas li ntawd, hom tshuaj hnyav twg yog siv rau crystallization?
Diethyl ether hmoov (CH3CH2OCH2CH3) muaj txiaj ntsig zoo raws li cov kuab tshuaj nrog ligroin , mas nws kub taw tes , 35 ° C (95 ° F), tsawg dhau los ua kom muaj cov kuab tshuaj crystallization zoo, tshwj tsis yog siv cov dej khov qhuav / acetone da dej.
Vim li cas ethanol yog cov kuab tshuaj zoo rau recrystallization?
Ethanol /dej sib txuas ua ke feem ntau siv vim ethanol muaj zoo muaj peev xwm ua kom yaj rau ntau cov organic, tab sis kuj tseem muaj qhov sib xyaw ua ke nrog dej. Ntxiv cov dej tuaj yeem nrawm thiab ua rau txo qis qhov sib tov ntawm ntau cov organic thiab yog li ua kom muaj crystallization.
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