Video: Yuav ua li cas silica gel npaj rau kem chromatography?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kev npaj ntawm Kem :
Npaj slurry ntawm silica gel nrog ib tug haum hnyav & ncuav maj mam rau hauv lub kem . Qhib qhov nres qaib & cia qee qhov hnyav kom ntws tawm. Txheej ntawm cov kuab tshuaj yuav tsum nco ntsoov npog cov adsorbent; txwv tsis pub cov kab nrib pleb yuav tsim nyob rau hauv kem
Tsuas yog li ntawd, Silica Gel ua dab tsi hauv kab chromatography?
Silica gel yog ib tug polar adsorbent thiab yog me ntsis acidic nyob rau hauv cov xwm, nws muaj peev xwm nqus tau yooj yim cov ntsiab lus uas tej zaum yuav muaj nyob rau hauv cov khoom uas xav tau kev sib cais los yog purification. Nws kuj tseem paub zoo txog nws lub luag haujlwm hauv kev faib rov qab-theem chromatography.
Qhov thib ob, qhov twg cov khoom sib txuas ua ntej hauv kab chromatography? Cov kuab tshuaj tsawg-polar yog ua ntej siv rau lus tsawg-polar compound . Ib zaug tsawg-polar compound yog tawm ntawm kem , ib qho ntxiv-polar hnyav ntxiv rau hauv kem rau lus qhov ntau-polar compound.
Hais txog qhov no, koj yuav ua li cas npaj cov slurry rau kab chromatography?
Muab 15 mL ntawm hexanes rau hauv 125 mL Erlenmeyer hwj thiab maj mam ntxiv cov hmoov alumina, me ntsis ntawm ib lub sij hawm, thaum swirling. Siv Pasteur pipet los sib tov slurry , ces sai sai pipet lub slurry mus rau ntawm kem (koj tuaj yeem ncuav nws hloov yog tias koj nyiam).
Koj siv silica ntau npaum li cas hauv ib kem?
Qhov ntau zoo yog 100/20 txog 100/10 (5 mus rau 10 mL) ntawm elutant rau 100g silica . Nws tsis yog ib lub tswv yim zoo siv ib qho hnyav sib txawv ntawm no - kev sib cais yuav raug cuam tshuam loj heev.
Pom zoo:
Dab tsi yog kem li cuam tshuam rau nyias txheej chromatography?
Kem chromatography yog lwm hom kua chromatography. Nws ua haujlwm zoo li TLC. Tib theem nyob ruaj ruaj thiab tib theem mobile siv tau. Es tsis txhob kis ib txheej nyias ntawm cov theem nyob ruaj ruaj rau ntawm ib lub phaj, cov khoom yog ntim rau hauv ib qho ntev, iav kem xws li hmoov los yog slurry
Nyias txheej chromatography txawv ntawm daim ntawv chromatography li cas?
Qhov sib txawv ntawm cov txheej nyias nyias chromatography (TLC) thiab ntawv chromatography (PC) yog tias, thaum lub sij hawm nyob ruaj ruaj hauv PC yog ntawv, cov theem nyob ruaj khov hauv TLC yog txheej nyias ntawm cov khoom siv tsis zoo uas txhawb nqa ntawm lub tiaj tus, tsis muaj zog
Yuav ua li cas koj ntim kab rau kab chromatography?
Packing a (silica gel) kem: Siv ib daim hlau los ntxiv ib lub paj rwb rau hauv qab ntawm kem. Clamp lub kem mus rau ib lub nplhaib sawv ntsug thiab ntxiv cov xuab zeb txaus kom sau qhov nkhaus ntawm kab. Muab ib tug pinch clamp rau ntawm lub raj, ces sau rau sab 1/4 mus rau 1/3 tag nrho nrog rau qhov intial eluent
Yuav ua li cas yog lub geological kem siv nyob rau hauv cov txheeb ze sib tam?
Lub geological kem yog ib qho kev tsim kho ntawm lub ntiaj teb keeb kwm raws li lub hnub nyoog ntawm cov fossils tau npaj los ntawm lub tswv yim ntawm qhovntsej thiaj tsis mob nrog kev hloov kho. Cov fossils hauv strata yog siv los txiav txim hnub txheeb ze, qhov yooj yim cov pob txha loj dua cov pob txha. Strata yog hnub tim raws li cov pob txha muaj nyob hauv lawv
Kuv yuav npaj li cas rau O'Level chemistry?
Nyeem ntxiv los tshawb txog Sheryl's 5 lub tswv yim txhawm rau txhawm rau 'O' Qib Chemistry Paper 2. Yuav kom tau qhab nia zoo, cov tub ntxhais kawm yuav tsum: paub lawv cov ntsiab lus zoo. xyaum tswj lub sijhawm. txheeb xyuas hom lus nug thiab cov kev xav tau nrog precision. teb txhua lo lus nug kom raug