4. a) Why is water added to the test tubes?b) Why must the test tubes be cooled before adding the 5 mL of water? PURPOSE:• To synthesize esters and to identify the odor of each●To write chemical equations for the formation of each esterAPPARATUS AND MATERIALS:test tubes400 mL beakerhotplateSAFETY:Note: ethanoic acid I;is labelled Glacial Acetic AcidPROCEDURE:Lab - MAKING ESTERSdrop bottles of:Sulfuric acid is extremely corrosive. Avoid direct contact. If any touches your skin, wash it off immediately. Note theeyewash station.Alcohols and carboxylic acids are flammable. Use caution.TEST TUBEconcentrated sulfuric acidmethanolethanol1-octanolABCDE1. Prepare a hot water bath using the 400mL beaker and hotplate. Adjust the heating control to maintain a watertemperature of about 70°C.2. Label 5 test tubes A to F. Place the test tubes on a test tube rack3. In the appropriate test tube, add 0.5 mL (10 drops) of alcohol followed by 0.5 mL (10 drops) of the carboxylic acidaccording to the table below.CARBOXYLIC ACID0.25 g salicylic acid0.5 mL ethanoic acid0.5 mL butanoic acid0.5 mL ethanoic acid0.5 mL ethanoic acidbutanoic (butyric) acidn-pentanolsalicylic acid(solid)ALCOHOL0.5 mL methanolpentan-1-ol0.5 mL ethanol0.5 mL ethanol0.5 mL 1-octanol4. Add 4-5 drops of concentrated sulfuric acid to each test tube. (caution, it is corrosive!) I will add it for you5. Place the test tubes in a hot water bath(use 400 mL beaker with about 200 mL of water)and gently heat atapproximately 70 °C for 10 minutes.6. Cool the test tubes by immersing them in a cold water bath.7. Add 5 mL of tap water to each of the test tubes. The ester will form a layer above the water.8. Carefully note the odor of the contents of each test tube.9. Discard the contents of the test tubes in the large beaker in the fume hood at the back of the room.

When carboxylic acid reacts with alchohol in the presence of concentrated sulfuric acid , esters are…

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4. a) Why is water added to the test tubes? b) Why must the test tubes be cooled before adding the 5 mL of water?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

4. a) Why is water added to the test tubes?
b) Why must the test tubes be cooled before adding the 5 mL of water?

PURPOSE:
• To synthesize esters and to identify the odor of each
●
To write chemical equations for the formation of each ester
APPARATUS AND MATERIALS:
test tubes
400 mL beaker
hotplate
SAFETY:
Note: ethanoic acid I;is labelled Glacial Acetic Acid
PROCEDURE:
Lab - MAKING ESTERS
drop bottles of:
Sulfuric acid is extremely corrosive. Avoid direct contact. If any touches your skin, wash it off immediately. Note the
eyewash station.
Alcohols and carboxylic acids are flammable. Use caution.
TEST TUBE
concentrated sulfuric acid
methanol
ethanol
1-octanol
A
B
C
D
E
1. Prepare a hot water bath using the 400mL beaker and hotplate. Adjust the heating control to maintain a water
temperature of about 70°C.
2. Label 5 test tubes A to F. Place the test tubes on a test tube rack
3. In the appropriate test tube, add 0.5 mL (10 drops) of alcohol followed by 0.5 mL (10 drops) of the carboxylic acid
according to the table below.
CARBOXYLIC ACID
0.25 g salicylic acid
0.5 mL ethanoic acid
0.5 mL butanoic acid
0.5 mL ethanoic acid
0.5 mL ethanoic acid
butanoic (butyric) acid
n-pentanol
salicylic acid(solid)
ALCOHOL
0.5 mL methanol
pentan-1-ol
0.5 mL ethanol
0.5 mL ethanol
0.5 mL 1-octanol
4. Add 4-5 drops of concentrated sulfuric acid to each test tube. (caution, it is corrosive!) I will add it for you
5. Place the test tubes in a hot water bath(use 400 mL beaker with about 200 mL of water)and gently heat at
approximately 70 °C for 10 minutes.
6. Cool the test tubes by immersing them in a cold water bath.
7. Add 5 mL of tap water to each of the test tubes. The ester will form a layer above the water.
8. Carefully note the odor of the contents of each test tube.
9. Discard the contents of the test tubes in the large beaker in the fume hood at the back of the room.

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