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 C $C a (O H)_{2}$
Ca(OH)2 is used for the softening of temporary hardness of water.

$N a_{2} C O_{3} + C a (O H)_{2} \to N a O H + C a C O_{3}$

$C a (O H) 2 + C O_{2} \to C a C O_{3} + H_{2} O$

Due to the formation of $C a C O_{3}$ , a white precipitate solution becomes cloudy.

So, the chemical formula of $(A)$ is $C a (O H)_{2}$ .

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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 $(A)$ ?