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Standard XII

Chemistry

Hardness of Water and Treatment

Chemical A is...

Question

Chemical A is used for softening of water to remove temporary hardness. A reacts with sodium carbonate to produce caustic soda, when $C O_{2}$ is bubbled through 'A', it turns cloudy. Chemically 'A' is:

C a O

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C a C O_{3}

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

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C a (O H)_{2}

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Solution

The correct option is D $C a (O H)_{2}$
$C a (O H)_{2}$ is used to remove temporary hardness of water.
$C a (O H)_{2} + C a (H C O_{3})_{2} \to 2 C a C O_{3} ↓ + 2 H_{2} O$
$C a (O H)_{2} + N a_{2} C O_{3} \to C a C O_{3} + 2 N a O H$
$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$
(Cloudy solution)
Hence, option D is correct

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Similar questions

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

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reacts with sodium carbonate to generate caustic soda. When

C O_{2}

is bubbled through the solution of

(A)

, it turns cloudy. What is the chemical formula of

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Chemical ‘A’ is used for water softening to remove temporary hardness. ‘A’ reacts with sodium carbonate to generate caustic soda. When carbon dioxide is bubbled through ‘A’, it turns cloudy. What is the chemical formula of ‘A’ ?

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Chemical A is used for softening of water to remove temporary hardness. A reacts with sodium carbonate to produce caustic soda, when CO2 is bubbled through 'A', it turns cloudy. Chemically 'A' is:

The correct option is D Ca(OH)2Ca(OH)2 is used to remove temporary hardness of water.Ca(OH)2+Ca(HCO3)2→2CaCO3↓+2H2OCa(OH)2+Na2CO3→CaCO3+2NaOHCa(OH)2+CO2→CaCO3+H2O (Cloudy solution)Hence, option D is correct

Chemical A is used for softening of water to remove temporary hardness. A reacts with sodium carbonate to produce caustic soda, when $C O_{2}$ is bubbled through 'A', it turns cloudy. Chemically 'A' is: