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CBSE Class 10 Answered

when CO2 is passed through lime water it turns milky. why?
Asked by | 16 May, 2013, 12:01: PM
answered-by-expert Expert Answer

Clear, colorless limewater absorbs carbon dioxide readily from air, giving a milky solution. This is due to the insoluble suspension of calcium carbonate formed:

Ca(OH)2(aq) + CO2(g) -> CaCO3(s) + H2O(l)

If excess CO2 is added, the following reaction takes place:

CaCO3(s) + H2O(l) + CO2(g) ? Ca(HCO3)2(aq)
Answered by | 16 May, 2013, 06:20: PM

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