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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10/12/2021 11:03 am

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Palak23

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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 CO₂ is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A?

(a) CaCO₃

(b) CaO

(d) Ca(HCO₃)₂

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10/12/2021 11:07 am

Reyana09

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Correct answer: (c) Ca(OH)₂

Explanation:

Ca(OH)₂ is used for the softening of temporary hard water.

Ca(OH)₂(aq) $\overset{CO_2}{\rightarrow}$ CaCO₃(s) + H₂O(l)

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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 CO2 is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A?

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