A student dropped a few pieces of marble in dil HCl contained in a test tube. The evolved gas was passed through lime water. What change would be observed in lime water? Write balanced chemical equations of reactions when
a) gas was evolved?
b) gas was passed through lime water
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Answer:
Reaction involved-
CaCO3+2HCl→CaCl2+CO2+H2O
The evolved gas is carbon dioxide which when passes through lime water turns it milky.
Ca(OH)2+CO2→H2O+CaCO3 ⇐ due to formation of this compounds
when excess CO2 is passed
CaCO3+H2O+CO2→Ca(HCO3)2
Bicarbonate is formed which again clears the solution.
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