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 change would be observed in a line water but will happen it excess of gas is passed through lime water with the help of Balanced chemical equation for all the change explain the observation​

Answer 1

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CaCO3 + 2HCl → CaCl2 + H2O + CO2 

Marble is calcium carbonate and on reacting with HCl releases CO2

Ca(OH)2 + CO2 → CaCO3 + H2O 

(Lime water)          (White ppt) 

Lime water turns milky due to the formation of white ppt of CaCO3 on passing excess CO2, milkiness disappears because Ca(HCO3)2 is formed which is soluble in water.  

CaCO3 + H2O + CO2 → Ca(HCO3)2  

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Answer 2

→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