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. If the chemical formula of A is $Ca (OH)_{2} + CO_{2} \rightarrow CaCo_{?} \downarrow + H_{2}O $ then what is the value of ?

Question

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. If  the chemical formula of A is  $Ca (OH)_{2} + CO_{2}  \rightarrow  CaCo_{?}  \downarrow + H_{2}O   $   then what is the value of ?

cdquestions Admin · Accepted Answer

Explanation: 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 → 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 → C a C O 3 ↓ + H 2 O Hence, the correct answer is 3.

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. If the chemical formula of A is \(Ca (OH)_{2} + CO_{2} \rightarrow CaCo_{?} \downarrow + H_{2}O \) then what is the value of ?

Correct Answer: 3

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