Red -deep blue-Green . … Thaum phenol yog reacted nrog NaNO2 thiab concentrated H2SO4, nws muab ib tug tob ntsuab. los yog xim xiav uas hloov mus rau liab ntawm dilution nrog dej. Generated tshuaj nyob rau hauv muaj NaOH / KOH restores thawj ntsuab los yog xiav xim. Cov tshuaj tiv thaiv no yog hu ua Liebermann cov tshuaj tiv thaiv nitroso.
Vim li cas phenol thiaj muab xim liab thiab xiav xim hauv Liebermann xeem?
Phenol muab Liebermann's nitroso kuaj kom muab cov xim xiav sib sib zog nqus vim tsim cov sodium ntsev ntawm indophenol.
Liebermann kuaj rau phenol yog dab tsi?
Ib txoj hauv kev kuaj rau phenols. Ib qho piv txwv me me ntawm cov tshuaj ntsuam xyuas thiab cov siv lead ua ntawm sodium nitrite yog yaj nyob rau hauv sov sulfuric acid. Cov tshuaj yog tom qab ntawd nchuav rau hauv cov dej alkali ntau dhau, thaum tsim cov xim xiav-ntsuab qhia tias muaj phenol.
Qhov twg ntawm cov phenol hauv qab no tsis muab cov tshuaj tiv thaiv Liberman nitroso?
Liebermann cov tshuaj tiv thaiv nitroso yog muab los ntawm phenol, 2∘ amine, thiab cov tebchaw uas muaj nitroso (-N=O) pawg. Yog li cov lus teb yog (c).
Phthalein test yog dab tsi?
Phthalein Dye Test
Txoj kev xav - Phenol tau condensed ntawm cua sov nrog phthalic anhydride nyob rau hauv lub xub ntiag ntawm conc. Sulfuric acid thiab tsim phenolphthalein. Phenolphthalein muab cov xim liab dawb ntawm cov tshuaj tiv thaiv nrog tsawg tsawg ntawm sodium hydroxide thaum nyob rau hauv ntau tshaj ntawm sodium hydroxide nws muab cov xim tsis muaj xim.compound.
