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
Answers
The correct set of observation is B
Explanation:
NaHCO₃ (aq) + CH₃COOH (aq) → CH₃COONa (aq) + H₂O (l) + CO₂ (g)
When acetic acid or ethanoic acid is added to the sodium hydrogen carbonate, we get an aqueous solution of sodium acetate, water and carbon dioxide gas. Acetic acid is colourless and has a smell of vinegar. When it reacts with sodium hydrogen carbonate solution it evolves a carbon dioxide gas which gives effervescence i.e., gas bubbles are produced in the solution.
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