2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Vim li cas dej yog cov kuab tshuaj zoo rau recrystallization ntawm acetanilide? Acetanilide nkag tau yooj yim yaj hauv dej kub, tab sis yog insoluble ntawm qis temps. Yog li, nws dissolves hauv dej kub tab sis crystalizes yooj yim thaum txias. … Vim charcoal insoluble, qhov sib tov tuaj yeem ua kom sov thiab cov charcoal tshem tau.
Vim li cas dej thiaj siv los ua cov kuab tshuaj hauv recrystallization?
Zoo, dej pheej yig, tsis muaj hluav taws kub, thiab koj tsis tas yuav qhuav. Ntawm qhov tod tes, koj yuav tsum tau qhuav cov crystals yog tias koj tau siv dej los ua kom rov ua dua.
dej puas tuaj yeem ua cov kuab tshuaj recrystallization?
Cov kuab tshuaj yuav tsum tau boiling tsawg (feem ntau qis dua 100C). Rau feem ntau cov organic tebchaw, dej tsis yog ib qho zoo recrystallization hnyav. Recrystallization yuav tsum tau ua siab ntev tseem ceeb yog li npaj ua siab ntev.
Vim li cas dej thiaj tsim nyog cov kuab tshuaj rau recrystallization ntawm benzoic acid?
Raws li cov kua qaub, benzoic acid yog tus neeg pub khoom noj proton, thiab thaum nws poob nws cov proton, cov benzoate ion raug them. Lub solubility ntawm benzoic acid nyob rau hauv dej ntawm chav tsev kub yog me me, tab sis cov solubility ntawm benzoate ion yog siab heev nyob rau hauv dej.
Dab tsi ua rau cov kuab tshuaj recrystallization zoo thiab yog vim li cas?
Cov qauv siv los xaiv cov kuab tshuaj recrystallization tsim nyog suav nrog: … nrhiav cov kuab tshuaj nrog qhov kub thiab txias coefficient. Cov kuab tshuaj yuav tsum tsis yaj lubqhov sib xyaw ua ke ntawm qhov kub qis (uas suav nrog chav sov), tab sis yuav tsum yaj cov khoom sib xyaw ntawm qhov kub siab.
Pom zoo:
Puas yog cov dej khov ntev ntev dua li cov dej khov nab kuab?
Lwm qhov sib txawv loj ntawm glacials thiab interglacials yog cov kev hloov hauv dej hiav txwv. Thaum lub sij hawm glacial, cov dej hiav txwv poob qhov nruab nrab ntawm 100m raws li cov dej evaporated thiab khaws cia rau hauv cov glaciers loj hlob thiab cov ntawv dej khov.
Puas yog acetone ua cov kuab tshuaj recrystallization zoo?
Kev piav qhia: Cov kuab tshuaj siv rau recrystallization qhov zoo tshaj plaws muab cov dej tsis zoo hauv cov kuab tshuaj txias, tab sis zoo rau middling solubility hauv cov kuab tshuaj kub. … Acetone nyiam ua cov kuab tshuaj zoo ntawm txhua qhov kub;
Cov piv txwv ntawm cov kuab tshuaj thiab cov kuab tshuaj yog dab tsi?
Solutes yog cov khoom uas yaj rau hauv cov kuab tshuaj thiab peb xaus nrog kev daws. Qee qhov piv txwv ntawm cov kuab tshuaj yog dej, ethanol, toluene, chloroform, acetone, mis nyuj, thiab lwm yam. Piv txwv ntawm cov kuab tshuaj muaj xws li, qab zib, ntsev, oxygen, thiab lwm yam … Cov dej dej muaj dej (kua kua) thiab yaj oxygen (solute).
Puas muaj cov kuab tshuaj ntau dua li cov kuab tshuaj?
Ib tshuaj yog ib homogeneous sib tov ntawm ob los yog ntau tshaj tshuaj. Cov khoom uas muaj nyob rau hauv qhov loj tshaj plaws yog hu ua cov kuab tshuaj thiab ib qho tam sim no nyob rau hauv lub me me yog hu ua ib tug solute. Tsuas muaj ib qho kuab tshuaj xwb, tab sis muaj peev xwm ua tau ntau yam.
Vim li cas cov dej khov nab kuab ntab saum dej?
Dab tsi yog qhov tshwj xeeb ntawm cov dej khov ua rau nws ntab? Ntseeg nws los tsis yog, dej khov tiag tiag li 9% tsawg dua li dej. Txij li cov dej hnyav dua, nws hloov cov dej khov sib zog, ua rau cov dej khov ntws mus rau saum. Vim li cas dej khov ntab saum dej hoob 9?
