Video: Cov tshuaj twg muab cov kev kuaj Fehling?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Formic acid (HCO2H) kuj muab apositive Fehling qhov kev xeem Qhov tshwm sim, zoo li nws ua nrog Tollens ' xeem thiab Benedict qhov kev xeem kuj. Qhov zoo kuaj yog zoo ib yam nrog nws tau nkag oxidizable tocarbon dioxide.
Ntawm no, qhov twg muab Fehling qhov kev sim tshuaj?
Fehling's Test . Hauv no xeem Lub xub ntiag ntawm aldehydes tab sis tsis ketones yog kuaj pom los ntawm kev txo qis ntawm lub deepblue daws ntawm tooj liab (II) mus rau liab precipitate ntawm insoluble tooj liab oxide. Cov xeem Feem ntau yog siv los txo cov suab thaj tab sis paub tias tsis yog foraldehydes tshwj xeeb.
Tsis tas li ntawd, Fehling reagent formula yog dab tsi? Fehling's Reagent muaj ib tug sib tov ntawm twosolutions ( Fehling Solution A & B). Kev daws teeb meem A yog tsim los ntawm aqueous tooj liab sulfate thiab Kev daws teeb meem B yog tsim los ntawm Rochelle ntsev los yog alkaline sodiumpotassium tartrate.
Tsis tas li ntawd, cov kev cuam tshuam dab tsi cuam tshuam nrog Fehling qhov kev sim?
Muaj ntau ntau yam reagents, suav nrog Tollens ', Fehling cov , Benedict's thiab Barfoed's reagents, yog siv los soj ntsuam txo cov suab thaj. Lub Benedict, Fehling thiab Barfoed kuaj nyob ntawm qhov tsim ntawm tooj liab (I) oxideprecipitate los qhia qhov zoo tshuaj tiv thaiv.
Koj yuav kuaj li cas rau aldehydes?
Tollens' xeem , kuj hu ua silver-daim iav xeem , yog ib lub chaw kuaj zoo xeem siv los paub qhov txawv ntawm ib aldehyde thiab ketone. Nws exploits qhov tseeb tias aldehydes yog nkag tau oxidized (saib oxidation), hos ketones tsis.
Pom zoo:
Puas muaj ntxhiab aldehydes muab Fehling kuaj?
Fehling's Test & Fehling'sReagent Cov tshuaj tiv thaiv yuav tsum tau cua sov ntawm aldehyde nrog Fehling's Reagent uas yuav ua rau tsim cov xim liab-xim av precipitate. Yog li, cov tshuaj tiv thaiv ua rau tsim cov carboxylate anion. Txawm li cas los xij, aromaticaldehydes tsis hnov mob rau Fehling'sTest
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