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On passing excess carbon dioxide gas thr...

On passing excess carbon dioxide gas through lime water, it first turns milky and then becomes colourless, explain why ? Write all the chemical equation related to it.

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`Ca(OH)_(2) + CO_(2) rarr CaCO_(3) + H_(2)O`
`CaCO_(3) + CO_(2) + H_(2)O rarr Ca(HCO_(3))_(2)`
Lime water turns milky due to the formation of calcium carbonate. It becomes colourless when excess of `CO_(2)` is passed due to the formation `Ca(HCO_(3))_(2)` which is soluble in water.
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