Question

blow some air with the help of a straw in the rest of lime water do you find any change in colour?

Answer 1

yes, lime water turns milky due to carbon dioxide blown into it through our mouth.
reaction-
Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)

hope this helps you...

Answer 2

Hey dear here is your answer

The lime water turns from colourless to milky.

This is because the exhaled air contains about 4% CO2.

CO2 reacts with lime water to form a milky coloured compound.

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)

The milkiness disappears since calcium bicarbonate is water-soluble.

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