It turns lime water milky.
NB, the milkiness ii due to formation of CaCO3 which will disappear in excess of CO2 to form soluble.
Ca(HCO3)2.
CO2 + Ca(OH)2 → CaCO3(S) + H2O0
Milky colour
2CO2(S) + Ca(OH)2 → Ca(HCO3)2
Clear colour
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