Question

A student takes about 2 mL ethanoic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He reports the following observations:; I. Immediately a colourless and colourless gas evolves with a brisk effervescence.; II. The gas turns lime water milky when passed through it.; III. The gas bums with an explosion when a burning splinter is brought near it.; IV. The gas extinguishes the burning splinter that is brought near it.; The correct observations are; A. I, II and III; B. II, III and IV; C. III, IV and I; D. I; II and IV(All India - 2014)

Answer 1

B is the correct answer

Answer 2

The observations given in option D. (I, II, and IV) are correct one for the reaction of ethanoic acid with sodium hydrogen carbonate.

Explanation:

• The chemical equation involved in the reaction of ethanoic acid with sodium hydrogen carbonate is as follows:

$NaHCO_3+CH_3COOH\rightarrow CH_3COONa+H_2O+CO_2$

• As per the above chemical equation, it is clear that carbon dioxide is obtained as one of the products.
• The characteristic features of carbon dioxide gas are as follows:

1. It turns lime water into milky.
2. It doesn't support burning.

• When the student adds a pinch of sodium hydrogen carbonate to the dry test tube containing 2 ml of ethanoic acid he observes the following:

1. Due to the formation of Carbon dioxide, a brisk effervescence evolves immediately.
2. As carbon dioxide gas is present, when lime water is added to the test tube, it turns milky.
3. When a burning splinter is bought near the test tube, the fire is extinguished, as carbon dioxide doesn't support burning.

• Thus it is inferred that the observations given in option D. (I, II, and IV) are correct one for the reaction of ethanoic acid with sodium hydrogen carbonate.

Learn more about such concept

Write chemical equation of the reaction of ethanoic acid with the following :

(1)sodium

(2)Sodium Hydroxide

(3)ethanol

write the name of one main product of each reaction.

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