Question

Give reason: quicklime solution turns milky when CO2 gas is made to pass through it. Hence
write equation for reaction.
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Answer 1

Answer:

Calcium hydroxide is sparingly soluble in water producing an alkaline solution known as limewater. When carbon dioxide gas is passed through or over limewater, it turns milky due to the formation of calcium carbonate. Lime reacts with acidic gases like sulfur dioxide.

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Answer 2

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Lime water is basically an aqueous solution of Calcium Hydroxide , formula, Ca(OH)2Ca(OH)2.

So this solution is alkaline, and Carbon Dioxide is acidic oxide. So when Carbon dioxide (CO2CO2 ) is passed through lime water, an Acid-Base reaction takes place producing salt and water.

The reaction is written as,

Ca(OH)2+CO2→CaCO3+H2OCa(OH)2+CO2→CaCO3+H2O

Calcium Carbonate ( CaCO3CaCO3) is insoluble in water, thus forming white precipitate, making the solution appear milky.

This also serves as the classic test for carbon dioxide.

Now, if through the milky solution, more Carbon dioxide is passed, the milkiness disappears.

The reaction is,

CaCO3+CO2+H2O→Ca(HCO3)2CaCO3+CO2+H2O→Ca(HCO3)2

This Calcium Bicarbonate is soluble in water. Thus milkiness disappears on passing excess Carbon Dioxide.