when CO2 is passed through lime water it turns milky. why?

Asked by  | 16th May, 2013, 12:01: PM

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  | 16th May, 2013, 06:20: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.