a student dropped few pieces of marble in dilute HCl contained in a test tube the involved gas when pass through lime water turns lime water milky
Answers
Answer:
The gas formed is CO2 .
Explanation:
CO2 turns lime water milky as it forms calcium carbonate.
A student dropped few pieces of marble in dilute HCl contained in a test tube.
The chemical name of marble is Calcium Carbonate having formula CaCo3.
The following reaction takes place:
CaCo3 + 2HCl → CaCl2 + CO2 + H2O
When Calcium carbonate reacts with dilute Hydrochloric acid then formation of Calcium chloride, carbon-dioxide (gas) and water takes place.
Now, the involved gas i.e. CO2 was passed through lime water (Slaked lime).
The following reaction takes place:
Ca(OH)2 + CO2 → CaCO3 + H2O
When Carbon dioxide passed through Slaked lime then milky solution is formed due to insoluble suspension of calcium carbonate.
The above reaction is Double Displacement Reaction because exchange of ions takes place.