Question

a student dropped few particles of marble in dilute HCl contained in a test tube. the evolved gas has then passed through lime water what change would the observed in lime water ?write balanced chemical equation for both the change observed.

Answer 1

lime water will turn milky.
The reaction happened is
2HCl+CaCo3----->CaCl2+H2O+CO2

Answer 2

When dilute HCl is added to marble which is calcium carbonate, it forms calcium chloride, water and carbon dioxide. The chemical equation for the reaction is as follows: CaCO3 + 2HCl → CaCl2 + H2O + CO2

Carbon dioxide gas turns lime water milky due to the formation of calcium carbonate.

The chemical equation showing the reaction between lime water and carbon dioxide is as follows: Ca(OH)2 + CO2 → CaCO3 + H2O.