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Photo: Icon Audiovisual Chemistry The esters are insoluble in water but soluble in alcohol, ether, and chloroform. How do not exhibit hydrogen bonding, the esters have boiling point lower than those of alcohols and acids of similar molecular weight. ACTIVITY Synthesis of substance: What is needed is: round bottom flask 100ml, condenser tubes, gas burner, universal stand pipe, rubber, cork, glacial acetic acid, ethanol (alcohol) and concentrated sulfuric acid. Place the round bottom flask 10 ml of glacial acetic acid and 10 ml of ethanol (alcohol) using the tubes. Add slowly with stirring 2.5 ml of concentrated sulfuric acid, using the beaker. Adjust the condenser in the vertical position, the round bottom flask. Attach the flask to the condenser in the universal as the figure alongside: Carefully heat the round-bottom flask, flame in Direct for 15 to 20 minutes. Do not forget to turn on the tap to cool the condenser. Let the product cool and disassemble the apparatus. What is the characteristic odor? What is the function of the sulfuric acid esterification this? Why is it possible to say that there was formation of ester in the experiment? The same structure can have several physiological functions. These structures are substances with mixed functions, such as, for example, the flavonoids. You ever heard of flavonoids? Fermented and Distilled. There Restrictions!
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Foto: Icon audiovizualnu politiku Kemija Esteri su netopljivi u vodi, ali topljiv u alkoholu, eter i kloroform. Kako ne pokazuju vodikove veze, esteri su točke vrenja niža od one od alkohola i kiselina slične molekularne težine. AKTIVNOST Sinteza tvari: To traje od: 100ml okruglim dnom tikvicama, kondenzator cijevi, plinski plamenik, univerzalnim postoljem cijevi, gume, pluta, ledene octene kiseline, etanol (alkohol) i koncentriranom sumpornom kiselinom. Postavite okrugli dno tikvicu 10 ml ledene octene kiseline i 10 ml etanola (alkohola) pomoću cijevi. Dodaj polako miješajući 2.5 ml koncentrirane sumporne kiseline, koristeći čašu. Prilagodite kondenzator u okomitom položaju, okrugli dno tikvice. Spojite tikvicu na kondenzatoru u univerzalno, kao na slici uz: Pažljivo zagrijati tikvicu s okruglim dnom, plamen u Izravno za 15 do 20 minuta. Ne zaboravite uključiti slavine da se ohladi u kondenzator. Neka proizvod ohladi i rastavljati aparat. Što je karakteristican miris? Što je funkcija sumporne kiseline esterifikacijom ovaj? Zašto je moguće reći da je formiranje estera u eksperimentu? Ista struktura može imati nekoliko fizioloških funkcija. Ove strukture su tvari s mješovitim funkcija, kao što su, na primjer, flavonoidi. Jeste li ikada čuli za flavonoida? Fermentiranog i destilirana. Tu Ograničenja!