Video: Cov qauv ntawm 2 4 Dinitrophenylhydrazine yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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Yog li ntawd, koj yuav ua li cas 2 4 Dinitrophenylhydrazine?
Cov txheej txheem: Cov chav tsev yuav khoom npaj tus 2 , 4 - dinitrophenylhydrazine kuaj reagent rau koj. Nws yog npaj los ntawm dissolving 1.0 g ntawm 2 , 4 - dinitrophenylhydrazine Nyob rau hauv 5.0 mL ntawm concentrated sulfuric acid thiab maj mam ntxiv cov tshuaj no nrog stirring rau ib tug daws ntawm 7.0 mL dej nyob rau hauv 25 mL 95% ethanol.
Qhov thib ob, hom tshuaj tiv thaiv dab tsi tshwm sim ntawm carbonyl compound thiab 2 4 Dinitrophenylhydrazine? Cov cov tshuaj tiv thaiv ntawm carbonyl compound thiab 2 , 4 -DNPH yog condensation, qhov twg ob qho tib si tshuaj sib xyaw ua ke thiab me me molecule H 2 O yog tshem tawm. Txhawm rau kos cov khoom yooj yim peb tuaj yeem taw tes rau carbonyl pab pawg ua haujlwm ntawm hydrazine functional pab pawg, ntim dej, thiab koom nrog 2 fragments ntawm C = N daim ntawv cog lus.
Tsis tas li ntawd, 2 4 Dinitrophenylhydrazine 2 4 DNP puas tuaj yeem kuaj qhov txawv ntawm aldehydes thiab ketones?
Rau xeem rau ib aldehyde los yog ketone lub cev koj yuav siv 2 , 4 - dinitrophenylhydrazine ( 2 , 4 - DNP ). 2 , 4 - DNP tov nrog methanol thiab sulfuric acid yog paub raws li Brady's reagent. Yog hais tias ib tug silver grey khoom los yog daim iav zoo li cov nyhuv yog tsim, ib aldehyde yog tam sim no. Yog ib ketone lub cev yog tam sim no, muaj yuav yuav tsis muaj tshuaj tiv thaiv.
Qhov kuaj pom zoo 2/4 DNP qhia li cas?
2 , 4 - Dinitrophenylhydrazine tuaj yeem siv los txheeb xyuas qhov zoo ntawm carbonyl kev ua haujlwm ntawm ketone lossis aldehyde ua haujlwm pab pawg. A kuaj qhov zoo yog taw qhia los ntawm kev tsim cov daj, txiv kab ntxwv lossis liab precipitate (lub npe hu ua dinitrophenylhydrazone).
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