State your observations and give balanced equations of the reactions when carbon dioxide is passed through clear lime water
(a)for a short time
(b)for a long time
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a) When carbon dioxide is passed through lime water for a short time,it turns lime water milky due to formation of a white precipitate of calcium carbonate.
The reaction is-
Ca(OH)2 + CO2  CaCO3 + H2O
b) When carbon dioxide gas is passed through lime water for a considerable time ,then the white precipitate of calcium carbonate which is fomed initially as shown in the above reaction ,dissolves due to formation of a soluble salt calcium hydrogen carbonate and the solution becomes clear again.
The reaction is -
CaCO3 + CO2 + H2O  Ca(HCO3)2
Aruyadav:
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a)when carbondioxide gas is passed through the freshly prepared lime water then the lime water turns milky white due to the formation of a precipitate.
Ca (OH)2 + CO2 ---> CaCO3 + H2O
b) When carbondioxide gas is passed through the lime water for a long time then the lime water again turns trans parent
CaCO3 + H2O +CO2 ---> Ca(HCO3)2.
Thus calcium hydrogen carbonate is formed.
Ca (OH)2 + CO2 ---> CaCO3 + H2O
b) When carbondioxide gas is passed through the lime water for a long time then the lime water again turns trans parent
CaCO3 + H2O +CO2 ---> Ca(HCO3)2.
Thus calcium hydrogen carbonate is formed.
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