Four students observed the colour and odour of acetic acid and its reaction with sodium hydrogencarbonate- They tabulated their observations as given below- Student Colour of acetic acid Odour of acetic acid Action with sodium hydrogencarbonate A blue fruity gas evolves without bubbles B colourless smell of vinegar effervescence C light green odourless gas evolves without bubbles D light brown rotten eggs effervescence The correct set of observation is that of student-1 A2 B3 C4 D

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Standard XII

Chemistry

Preparation of Alcohols from Carbonyl Compounds

Four students...

Question

Four students observed the colour and odour of acetic acid and its reaction with sodium hydrogencarbonate. They tabulated their observations as given below.

Student Colour of acetic acid Odour of acetic acid Action with sodium hydrogencarbonate

A
B
C
D blue
colourless
light green
light brown fruity
smell of vinegar
odourless
rotten eggs gas evolves without bubbles
effervescence
gas evolves without bubbles
effervescence

The correct set of observation is that of student:
(1) A
(2) B
(3) C
(4) D

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Solution

Ethanoic acid is commonly known as acetic acid. It is colorless gas having a smell of vinegar. On reaction with sodium hydrogen carbonate, it gives carbon dioxide which gives effervescence.
${CH}_{3} COOH (aq) + {NaHCO}_{3} (aq) \to {CH}_{3} COONa (aq) + H_{2} O (l) + {CO}_{2} (g)$

Hence the correct option is 2.

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(a) No reaction takes place.
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Q. Four students added a small amount of ethanoic acid to sodium hydrogencarbonate. The gas evolved was tested for its behaviour with burning splinter and lime water. They reported their observations as given below.

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A	CO₂	The flame of splinter extinguishes and gas does not burn	Turned milky
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Student	Action on red litmus	Action of pH paper
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The correct set of observations was made by the student :
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Student	Colour of acetic acid	Odour of acetic acid	Action with sodium hydrogencarbonate
A B C D	blue colourless light green light brown	fruity smell of vinegar odourless rotten eggs	gas evolves without bubbles effervescence gas evolves without bubbles effervescence

Ethanoic acid is commonly known as acetic acid. It is colorless gas having a smell of vinegar. On reaction with sodium hydrogen carbonate, it gives carbon dioxide which gives effervescence. CH3COOH(aq)+NaHCO3(aq)→CH3COONa(aq)+H2O(l)+CO2(g) Hence the correct option is 2.