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

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Q. Chemical $A$ is used for water softening to remove temporary hardness. $A$ reacts with sodium carbonate to generate caustic soda. When $CO_2$ is bubbled through a solution of $A$, it turns cloudy. What is the chemical formula of $A$

Hydrogen

Solution:

$Ca(OH)_2$ is used for the softening of temporary hard water.
$Ca(OH)_2(aq) + CO_2(g) \rightarrow \underset{\text{cloudiness}}{CaCO_3(s) }+ H_2O(l)$