Look at Figure 4.1 and answer the following questions
(a) What change would you observe in the calcium hydroxide solution taken in tube B?
Ans. Calcium hydroxide solution in the test tube B becomes milky.
(b) Write the reaction involved in test tubes A and B respectively.
Ans. Reaction in test tube A:
CH3COOH + NaHCO3 → CH3COONa + CO2 + H2O
Reaction in test tube B:
Ca(OH)2 + CO2 → CaCO3 + H2O
(c) If ethanol is given instead of ethanoic acid, would you expect the same change?
Ans. Ethanol does not react with sodium hydrogen carbonate. Hence, same change cannot be observed.
(d) How can a solution of lime water be prepared in the laboratory?
Ans. For this, take distilled water in a beaker and mix calcium carbonate powder in it. After stirring thoroughly, wait till the mixture settles. Decant the clear liquid from the beaker. This liquid is lime water.
