Question

a student dropped few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was then passed through lime water .what will happen if excess of gas is passed through lime water ?

Answer 1

Marble is chemically calcium carbonate. When dilute HCl is added to 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. Following is the chemical equation showing the reaction between lime water and carbon dioxide.

 Ca(OH)2 + CO2 → CaCO3 + H2O



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Answer 2

Answer: Marble is Calcium Carbonate (CaCO3)   Calcium carbonate when added to HCl gives Calcium Chloride, Water and Carbon Dioxide.      CaCO3 + HCl --> CaCl2 + H2O + CO2 When this gas (which is CO2) is passed through lime water, Lime water turns milky due to the formation of CaCO3 and H20.      Ca(OH)2 + CO2 --> CaCO3 + H2O