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What is lime water test for the detectio...

What is lime water test for the detection of carbon dioxide?

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When carbon dioxide gas is passed through lime water it turns milky due to the fonnation of a milky suspension (precipitate) of calcium carbonate. Carbon dioxide is produced by the action of dilute HCI on sodium carbonate.
`Na_2CO_3(s)+2HCl(aq)to2NaCl+H_2O(l)+CO_2`
Carbon dioxide gas which prod.uccd in this reaction is passed through lime water that changes to a milky colour due to the formation of calcium carbonate.
`Ca(OH)_2(aq)+CO_2(g)toCaCO_3+H_2O(aq)`
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