Question

A student dropped few pieces of marble in HCL . The gas evolved was passed through lime water . What change would be on in like water.

Answer 1

Lime water turns milky

Answer 2

Hi !

Marble -> Calcium Carbonate -> CaCO₃
Hydrochloric acid -> HCl

Acids reacts with metal carbonates to form salt,water, and carbon dioxide gas.

Acid + Metal carbonate -> Salt + H₂O + CO₂

HCl + CaCO₃ ----> CaCl₂ + H₂O + CO₂

The gas evolved when passes through lime water or Ca(OH)₂ , turns it milky , due to the formation of calcium carbonate(CaCO₃)

Ca(OH)₂ + CO₂    ------> CaCO₃ + H₂O