What do you observe when acetic acid is added to :
(a) sodium bicarbonate,
(b) ethyl alcohol in the presence of sulphuric acid,
(c) neutral $F e C l_{3}$ solution?

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Solution

(a) When acetic acid is added to sodium bicarbonate, carbon dioxide is
liberated.
$C H_{3} C O O H + N a H C O_{3} ⟶ C H_{3} C O O N a + H_{2} O + C O_{2}$

(b) When acetic acid is added to ethyl alcohol in presence of sulphuric acid ester
(ethyl acetate) is formed.

$C H_{3} - C O O H + C H_{3} - C H_{2} O H C o n c . H_{2} S O_{4} - ------- \to C H_{3} - C O O - C_{2} H_{5} + H_{2} O$

(c) When acetic acid is added to neutral $F e C l_{3}$ , wine red colour is produced.

$3 C H_{3} C O O H + F e C l_{3} ⟶ F e (C H_{3} C O O)_{3} + 3 H C l$

$F e (C H_{3} C O O)_{3}$ is responsible for the colour.

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