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Chemical Change

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Question

Give scientific reason:
When the gas formed on heating lime stone is passed through freshly prepared lime water, the lime water turns milky.

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Solution

When lime stone is heated, calcium oxide and carbon dioxide are formed. This carbon dioxide gas is passed through freshly prepared lime water, insoluble calcium carbonate and water are formed. In this reaction, lime water turns milky.

$Ca {(OH)}_{2} + {CO}_{2} \to {CaCO}_{3} + H_{2} O Calcium carbonate$

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