Question

When a chalk piece is immersed in water, bubbles are emitted: why?

Answer 1

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There r 2 reasons for this.. first is:

chalk is chemically calcium carbonate with formula CaCO3 when water, H2O is added a reaction takes place:

CaCO3 + H2O ----) H2CO3 + CaO

H2CO3 ------) H2O + CO2

Carbon-dioxide reacts with water resulting to Carbonic acid and Calcium carbonate or known as burnt lime. Carbonic acid will dissociate to water and Carbon dioxide a gas that escapes out of the water causing the bubbles. The precipitate that settles at the bottom of the glass is Calcium oxide.

second reason is..

The chalk is a porous material.. and when it is immersed in water, water fills in the pours and air escapes in bubbles.

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