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Question 18

Explain the following:

(a) Lime water turns milky on passing carbon dioxide gas into it.
(b) Bubbles are produced when acetic acid is added to a solution of sodium hydrogen carbonate.


Solution

(a) When carbon dioxide (CO2) reacts with lime water (Ca(OH)2), then calcium carbonate (CaCO3) and water (H2O) is formed.
Ca(OH)2+CO2CaCO3+H2O

(b) When baking soda (NaHCO3) is added to acetic acid (CH3COOH) then carbon dioxide (CO2) gas is formed which causes appearance of bubbles.​​​​​​
CH3COOH+NaHCO3CO2+other substances

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