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Chemical A is used for water softening t...

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 ?

A

`CaCO_3`

B

CaO

C

`Ca(OH)_2`

D

`Ca(HCO_3)_2`

Text Solution

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The correct Answer is:
C
`Ca(OH)_2` is used for softening of temporary hard water. With `Na_2CO_3` it gives NaOH.
`underset(A)Ca(OH)_2+Na_2CO_3to2NaOH+CaCO _3downarrow`
Milkiness is produced when `CO_2` is passed through a solution of `Ca(OH)_2` in water. It is due to the formation of `CaCO_3(s)`.
`Ca(OH)_2(aq)+CO_2(g)toCaCO_3(s)+H_2O(l)`
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