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Uses of Calcium Carbonate

Chemical A is...

Question

Chemical A is used for water softening to remove temporary hardness, A reacts with $N a_{2} C O_{3}$ to generate caustic soda. When $C O_{2}$ is bubbled through A, it turns cloudy. What is the chemical formula of A?

C a C O_{3}

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C a O

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C a (O H)_{2}

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C a (H C O_{3})_{2}

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Solution

The correct option is D $C a (O H)_{2}$
The chemical A is calcium hydroxide $(C a (O H)_{2})$ . It is used for water softening to remove temporary hardness.
It reacts with sodium carbonate to form caustic soda.
$N a_{2} C O_{3} + C a (O H)_{2} \to C a C O_{3} ↓ + N a O H$ .
With carbon dioxide gas, it forms calcium carbonate which turns lime water milky.
$C a (O H)_{2} + C O_{2} \to C a C O_{3} ↓ + H_{2} O$

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Chemical A is used for water softening to remove temporary hardness, A reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudy. What is the chemical formula of A?

Chemical A is used for water softening to remove temporary hardness, A reacts with $N a_{2} C O_{3}$ to generate caustic soda. When $C O_{2}$ is bubbled through A, it turns cloudy. What is the chemical formula of A?