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प्रश्न
A gas is liberated immediately with a brisk effervescence, when you add acetic acid to sodium hydrogen carbonate powder in a test tube. Name the gas and describe the test that confirms the identity of the gas.
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उत्तर
When acetic acid (CH3COOH) is added to the sodium hydrogen carbonate (NaHCO3) powder in a test tube, then the products obtained are sodium acetate, carbon dioxide and water.
Observations in this reaction are:
Brisk effervescence is seen because of CO2 gas escaping out from the reaction mixture. The gas turns lime water milky that confirms the identity of CO2 gas.
Chemical reactions involved:
CH3COOH + NaHCO3 →CH3COONa + CO2↑ + H2O
Ca(OH)2 + CO2 → CaCO3↓ + H2O
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संबंधित प्रश्न
When ethanoic acid reacts with sodium hydrogen carbonate, then a salt X is formed and a gas Y is evolved. Name the salt X and gas. Y Describe an activity with the help of a labelled diagram of the apparatus used to prove that the evolved gas is the one which you have named. Also write the chemical equation of the reaction involved.
While studying saponification reactions, the following comments were noted down by the students :
(I) Soap is a salt of fatty acids.
(II) The reaction mixture is basic in nature.
(III) In this reaction heat is absorbed.
(IV) This reaction is not a neutralisation reaction.
Which of these are the correct comments ?
(A) I and III only
(B) I, II and III
(C) II, III and IV
(D) I and II only
A student takes 2 mL acetic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He makes the following observations:
I. A colourless and odourless gas evolves with a brisk effervescence.
II. The gas turns lime water milky when passed through it.
III. The gas burns 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) IV, I and II
On adding 2 mL acetic acid to 2 mL of water in a test tube, it was observed that
(A) a clear and transparent solution is formed
(B) a white precipitate is formed almost immediately
(C) two separate layers were formed
(D) a colourless and odourless gas is evolved
Explain the following term with example.
Reduction
How is ethyne prepared in the laboratory?
Write the important uses of acetic acid.
CH3–CH2–CHO : propanal : : CH3–COOH : _______
Explain the following reaction with an example.
Saponification
Ethanoic acid is also known as which of these?
