Question

How is Carbon dioxide prepared in a laboratory?

Answer 1

Laboratory preparation of Carbon dioxide

• In the laboratory, carbon dioxide is prepared by the action of dilute hydrochloric acid on calcium carbonate in Woulfe's bottle.
• Some marble chips are taken and placed in Woulfe's bottle. A thistle funnel with a stopper is fitted in the bottle in such a way that it reaches the bottom of the bottle.
• Through the other mouth of the bottle as delivery, the tube is introduced as shown.
• Now dilute hydrochloric acid is poured onto the marble chips with the help of the thistle funnel. The other end of the delivery tube passes into a gas jar.
• Calcium carbonate reacts with dilute hydrochloric acid to form calcium chloride. In this reaction, carbon dioxide gas evolved with brisk effervescence.
• A few bubbles of carbon dioxide are allowed to escape as they might contain air and acid as impurities.
• Carbon dioxide is heavier than air and is collected in gas by upward displacement of air. Being heavier than air, carbon dioxide sinks and displaces the air, which rises upwards.

$$\begin{gathered} {\mathrm{CaCO}}_3\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to {\mathrm{CaCl}}_2\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right) \\ \mathrm{Calcium}\mathrm{Hydrochloric}\mathrm{acid}\mathrm{Calcium}\mathrm{Water}\mathrm{Carbon}\mathrm{dioxide} \\ \mathrm{carbonate}\mathrm{chloride} \end{gathered}$$