Q10 of 48 Page 9

Sodium hydrogen carbonate, when added to acetic acid, evolves a gas. Which of the following statements are true about the gas evolved?

(i) It turns lime water milky.


(ii) It extinguishes a burning splinter.


(iii) It dissolves in a solution of sodium hydroxide.


(iv) It has a pungent odour.

When sodium hydrogen carbonate is added to acetic acid, carbon dioxide (CO2) gas is evolved.


NaHCO3 + CH3COOH → CH3COONa + H2O + CO2


(Sodium hydrogen carbonate + Acetic acid = Sodium acetate + water + carbon dioxide)


Carbon dioxide supports all the above three properties. CO2 turns lime water milky, it is a non-supporter of combustion and is absorbed by strong alkalis such as NaOH.

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