Test for CO2

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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