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?

`CaCO_3`

CaO

`Ca(OH)_2`

`Ca(HCO_3)_2`

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