Because of the formation of which of the following lime water turns milky when carbon dioxide is passed in it?
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Lime water turns milky when you pass carbon dioxide through it because a reaction that produces a white precipitate takes place.
When you pass carbon dioxide through this solution, the two compounds carbon dioxide (CO2) and calcium hydroxide (CaOH2) will react to form white and insoluble calcium carbonate which precipitates out of the solution. The reaction is as follows:
Ca(OH)2(aq) + CO2(g) →CaCO3(s)↓+H2O
This is how the solution looks before and after reaction:

When excess CO2 is added, it reacts with calcium carbonate( CaCO3) and water (H2O) to form calcium bicarbonate Ca(HCO3)2 and since it is soluble in water, it dissolves in it making the solution clear again. The chemical reaction is as follows:
CaCO3 + CO2 + H2O ---------> Ca(HCO3)2
When you pass carbon dioxide through this solution, the two compounds carbon dioxide (CO2) and calcium hydroxide (CaOH2) will react to form white and insoluble calcium carbonate which precipitates out of the solution. The reaction is as follows:
Ca(OH)2(aq) + CO2(g) →CaCO3(s)↓+H2O
This is how the solution looks before and after reaction:

When excess CO2 is added, it reacts with calcium carbonate( CaCO3) and water (H2O) to form calcium bicarbonate Ca(HCO3)2 and since it is soluble in water, it dissolves in it making the solution clear again. The chemical reaction is as follows:
CaCO3 + CO2 + H2O ---------> Ca(HCO3)2
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