Video: Koj ua li cas 2/4 DNP xeem?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov 2, 4 Dinitrophenylhydrazine Test
Tsib tee ntawm qhov sib xyaw kom raug kuaj yog tov nrog 5 tee ntawm cov dinitrophenylhydrazine reagent (ib qho kua txiv kab ntxwv) hauv 2 ml ntawm ethanol thiab lub raj shaken. Yog tsis muaj qhov zoo xeem yog pom tam sim ntawd, qhov sib tov yuav tsum tau tso cai sawv ntsug rau 15 feeb.
Yog li ntawd, ketones puas muab 2/4 DNP kuaj?
Thaum ib tug aldehyde los yog a ketone lub cev yog muab tso rau hauv a 2 , 4 - DNP kev daws teeb meem, lub teeb daj-txiv kab ntxwv lossis liab cov txiaj ntsig, uas yog qhov zoo xeem . Yog tsis muaj aldehyde los yog ketone lub cev tam sim no, tsis muaj cov xim ci ntsa iab yog pom, thiab tus tshuaj tseem tsis muaj xim.
Ib yam li ntawd, dab tsi reagents tuaj yeem cuam tshuam nrog 2 4 Dnph test? Aldehydes thiab ketones hnov mob nrog 2, 4-dinitrophenylhydrazine reagent los ua daj, txiv kab ntxwv, lossis xim liab-txiv kab ntxwv precipitates, thaum cawv tsis hnov tsw. Kev tsim cov dej nag yog li ntawd qhia tias muaj aldehyde lossis ketone. Lub precipitate los ntawm qhov kev xeem no kuj ua hauj lwm raws li ib tug khoom derivative.
Tom qab ntawd, lo lus nug yog, qhov kev xeem DNP yuav txiav txim siab li cas thiab yuav ua li cas?
Brady tus xeem 2, 4- Dinitrophenylhydrazine tuaj yeem siv rau qualitatively ntes carbonyl functionality ntawm ketone los yog aldehyde functional pawg. Yog hais tias carbonyl compound yog aromatic, ces precipitate yuav ua liab; Yog hais tias aliphatic, ces lub precipitate yuav muaj xim daj ntau dua.
Cov qauv ntawm 2 4 Dinitrophenylhydrazine yog dab tsi?
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