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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?

A

`CaO`

B

`Ca(OH)_2`

C

`CaCO_3`

D

`Ca(HCO_3)_2`

Text Solution

Verified by Experts

The correct Answer is:
B
The chemical A is `Ca(OH)_2`.
Chemical A reacts with sodium carbonate to generate caustic soda.
`Ca(OH)_2 +Na_2CO_3 to underset("Caustic soda")(2NaOH) + CaCO_3`
When `CO_2` is būbbled through a solution A, it turns cloudy.
`underset("Cloudy")(Ca(OH)_2) + CO_2 to CaCO_3 darr + H_2O`
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