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

Answer»

Solution :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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