Chemical A is used for water softening t...

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

CaO

`Ca(OH)_(2)`

`CaCO_(3)`

`Ca(HCO_(3))_(2)`

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The correct Answer is:

The chemical A is Ca`(OH)_(2)` .
Chemical A reacts with sodium carbonate to generate caustic soda.
`Ca(OH)_(2) + Na_(2) CO_(3) rarr underset("Caustic soda")(2NaOH+ CaCO_(3))`
When `CO_(2)` is bubbled through a solution A it turns cloudy.
`underset("Cloudy")(Ca(OH)_(2))+ CO_(2) rarr CaCO_(3) darr + H_(2)O`

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