Q36 of 37 Page 336

An organic compound with molecular formula C2H4O2 produces brisk effervescence on addition of sodium carbonate /bicarbonate. Answer the following

a. Identify the organic compound.


b. Write the chemical equation for the above reaction.


c. Name the gas evolved.


d. Now will you test the gas evolved?


e. List two important uses of the above compound.

a. The organic compound is CH3COOH.


b. Ethanoic acid (CH3COOH) reacts with sodium carbonate (Na2CO3) to form sodium acetate and liberate CO2


CH3COOH + Na2CO3→CH3COONa + CO2


c. The gas evolved is CO2.


d. The CO2 gas of the effervescence passes through the gas delivery tube and reacts with the lime water in the small test tube. ‘Lime water turning milky’ is the test of carbon dioxide gas.


e. Two important uses of ethanoic acid are:


i. It is used as a preservative for pickles.


ii. It used in making vinegar.


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I ml glacial acetic acid and I ml of ethanol arc mixed together in a test tube. Few drops of concentrate sulphuric acid is added in the mixture are warmed in a water bath for 5 min. Answer the following

a. Name the resultant compound formed.


b. Represent the above change by a chemical equation.


c. What term is given to such an reactions.


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