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# What happens when carbon dioxide gas is bubbled through lime water?

Last updated date: 14th Sep 2024
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Hint: As we know that the formula of lime water is $Ca{{\left( OH \right)}_{2}}$ that is also called calcium hydroxide. When carbon dioxide gas is bubbled through lime water, an insoluble precipitate is formed, due to which the colour of the solution seems to be milky.

- As we know that the formula of lime water is $Ca{{\left( OH \right)}_{2}}$, when carbon dioxide gas is bubbled through lime water limestone $CaC{{O}_{3}}$ is formed which is basically an insoluble precipitate and the solution is seen to be milky. Limestone is found to be economically very much important.
$Ca{{\left( OH \right)}_{2}}\left( aq \right)+C{{O}_{2}}\left( g \right)\to CaC{{O}_{3}}\left( s \right)+{{H}_{2}}O(g)$
- Further, if we add more carbon dioxide, the precipitate that was formed starts dissolving. And there will be a formation of a colourless solution of $Ca{{\left( HC{{O}_{3}} \right)}_{2}}$that is called Hydrogencarbonate. We can see the reaction that takes place as:
$CaC{{O}_{3}}\left( s \right)+C{{O}_{2}}\left( g \right)+{{H}_{2}}O(g)\to Ca{{\left( HC{{O}_{3}} \right)}_{2}}\left( aq \right)$
- Hence, we can conclude that limestone $CaC{{O}_{3}}$ is formed when carbon dioxide gas is bubbled through lime water.