Question

Carboxylic Acids and Esters EXPERIMENT 22 OBSERVATIONS AND RESULTS Synthesis and Identification of an Ester: Esterification 1. Give the name and structure of the ester which you synthesized. What fruit did you associate with the odor of the ester? to noldsoinogs w to esar bnn eaman sd vio stolpi Look up the ester and its fruit sburce in your textbook. (If it is not in your textbook, ask your instructor.) Did you associate the ester with the right fruit? If not, with what fruit is the ester really associated? t blb anol wol Write an equation for this esterification reaction. SoiW dalninb golb Compare the odor of each of the reactants with your ester with respect to pleasantness and intenaity. A dn cesh s n- Why is the presence of H,SO, necessary for esterification to occur? cetSoy behuce 2. Hydrolyais of an Ester: Formation of an Acid and an Alcohol w What fruit did you associate with the odor of the starting ester? Find the fruit source of this ester in your textbook or ask your instructor. Were you cor- rect in your assignment? If not, with what fruit is the ester associated? 221 222. Chemistry and Life in the Laboratory hydrolysis of ethy What are the names and structures of the products that formed on butyrate? Which one of the products is responsible for the odor of the liquid What is your evidence? on the stirring rod? alala Describe the odor of the liquid on the stirring rod. Give a source of this odoriferous liquid in everyday life. adW aad to obo ab lw stsbosoy bib Saponification of an Ester 3. Give the names and uses of two commercial products which contain the ester methyl sal- icylate. oodbotuoy How long did it take for the ester layer to disappear (Le., for the saponification to occur)? n noltsol Did the odor of the ester also disappear or diminish? Which? nn Write an equation for the saponification reaction. Did precipitate form when the reaction (saponification) solution was write the structure of the compound that precipitated. hade de acidic? If so, Write an equation for the reaction that occurred when HCl was added to the saponifica- tion product Why was the carboxylic acid which resulted from the saponification process soluble in basic solution but not in acidic solution? 223 Carboxylic Acids and Esters 4. A Carboxylic Acid and Its Salt Solubility of Succinic Acid a. Draw the complete structure for succinic acid, showing all of the bonds with dashes. Why is succinic acid called a dicarboxylic acid? de icd belrate Does succinic acid dissolve in cold water? In hot water? What happened when the test tube was cooled? at ac aole bet b. Reactions of the Acid and Its Salt Did succinic acid dissolve when NaOH was added? Why? caleed acil Salf Record and explain what happened when the basic solution was made acidic with HaL cerapif Write equations for any reactions that occurred in this part of the experiment. CH NO

Answer 1

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