Advertisements
Advertisements
प्रश्न
A spatula full of sodium carbonate is taken in a test tube and 2 mL of dilute ethanoic acid is added to it.
Suggest a method of testing the gas liberated in the reaction.
Advertisements
उत्तर
To test the gas liberated in the reaction between sodium carbonate and dilute ethanoic acid, carbon dioxide (CO₂) passed through lime water (calcium hydroxide solution). If carbon dioxide is present, it reacts with the lime water to produce calcium carbonate, a white precipitate that turns the lime water milky. The change indicates the existence of carbon dioxide. The chemical reaction for this test is as follows:
\[\ce{CO2(g) + Ca(OH)2(aq) -> CaCO3(s) + H2O(l)}\]
This method effectively demonstrates the presence of carbon dioxide gas evolved during the reaction.
APPEARS IN
संबंधित प्रश्न
A student adds a few drops of ethanoic acid to test tubes X, Y and Z containing aqueous solutions of sodium chloride, sodium hydroxide and sodium carbonate, respectively. If he now brings a burning splinter near the mouth of the test tubes immediately after adding ethanoic acid in each one of them, in which of the test tube or test tubes the flame will be extinguished?
(A) X and Y
(B) Y and Z
(C) X and Z
(D) only Z
While studying saponification reaction for the preparation of soap, a teacher suggested to a student to add a small quantity of common salt to the reaction mixture. The function of common salt in this reaction is to
(A) reduce the alkalinity of the soap
(B) reduce the acidity of the soap
(C) enhance the cleansing capacity of soap
(D) favour precipitation of soap
When zinc powder is added to acetic acid ______________
(a) the mixture becomes warm
(b) a gas is evolved
(c) the colour of the mixture becomes yellow
(d) a solid settles at the bottom
Complete the following equation:
`CH_3 COOH + CH_2 H_5 OH` 
What type of compound is formed when a carboxylic acid reacts with an alcohol in the presence of conc. H2SO4?
Vinegar is a solution of about:
(a) 5 to 8 per cent ethanoic acid in alcohol
(b) 5 to 8 per cent ethanoic acid in water
(c) 50 to 80 per cent ethanoic acid in water
(d) 50 to 80 per cent ethanoic acid in alcohol
What do you observe when acetic acid is added to a neutral FeCl3 solution?
The functional group present in acetic acid is ______.
CH3–CH2–CHO : propanal : : CH3–COOH : _______
What happens when a small piece of sodium is dropped in ethanol? Write the equation for this reactions.
