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प्रश्न
A student is studying the properties of acetic acid. List two physical properties of acetic acid he observes. What happens when he adds a pinch of sodium hydrogen carbonate to this acid? Write any two observations.
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उत्तर
Physical properties of acetic acid:
a) It freezes during winters, as its melting point is 290 K.
b) It has a characteristic vinegar-like odour.
When a pinch of sodium hydrogen carbonate is added to acetic acid in a test tube, a brisk effervescence is observed due to evolution of a colourless and odourless carbon dioxide gas, CO2.
Chemical equations for the reaction:
CH3COOH(aq) + NaHCO3(s) → CH3COONa(aq) + H2O(l) + CO2(g)
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संबंधित प्रश्न
Consider the following comments about saponification reactions:
I. Heat is evolved in these reactions.
II. For quick precipitation of soap, sodium chloride is added to the reaction mixtures.
III. Saponification reactions are a special kind of neutralisation reactions.
IV. Soaps are basic salts of long-chain fatty acids.
The correct comments are
(a) I, II and III
(b) II, III and IV
(c) I, II and IV
(d) Only I and IV
A student takes about 6 ml of distilled water in each of the four test tubes P, Q, R and S. He then dissolves an equal amount of four different salts namely, sodium chloride in 'P', potassium chloride in 'Q', calcium chloride in 'R' and magnesium chloride in 'S'. Next, he then adds 10 drops of soap solution to each test tube and shakes its contents. The test tubes in which scum (insoluble substance) is formed with soap are:
(A) P and Q
(B) Q and R
(C) R and S
(D) Q and S
Name the following:
The distinctive reaction that takes place when ethanol is treated with acetic acid.
A student puts a drop of acetic acid first on a blue litmus paper and then on a red litmus paper. He would observe that
(A) the red litmus paper turns colourless and there is no change in the blue litmus paper.
(B) the red litmus paper turns blue and the blue litmus paper turns red.
(C) there is no change in the red litmus paper and the blue litmus paper turns red.
(D) there is no change in the blue litmus paper and the red litmus paper turns blue.
Explain the following term with example.
Reduction
What is vinegar and glacial acetic acid?
How will you carry out the following conversions?
Ethene to acetic acid
Ester is a sweet-smelling compound.
Give the balanced chemical equation of the following reaction:
Oxidation of ethanol by acidified potassium dichromate.
Give the balanced chemical equation of the following reaction:
Combustion of ethanol.
