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Balanced Chemical Equation

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Question

You have brushed the wall with an aqueous suspension of $C a {(O H)}_{2}$ . After two days the wall turned to white colour.
What are the steps involved in whitewashing the walls?
Write the balanced chemical reactions using appropriate symbols.

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Solution

Calcium hydroxide is formed when water and calcium oxide are combined together.
$C a O + H_{2} O \to C a (O H)_{2}$
When calcium hydroxide is painted on the walls and left for 2 days a layer of calcium carbonate is formed on the walls, which gives a white and shiny appearance to the walls. This is because of the reaction of calcium hydroxide with carbon dioxide to form calcium carbonate and water
$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$
This equation is already balanced.

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