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Chemical 'A' is used for water softening...

Chemical 'A' is used for water softening to remove temporary hardness. 'A' reacts with sodium carbonate to generate caustic soda. When carbon dioxide is bubbled through 'A' it turns cloudy. What is the chemical formula of 'A'

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`Ca(OH)_(2)` is used for water softening to remove temporary hardness.
`underset((X))(Ca(OH)_(2))+CaHCO_(3)rarr2CaCO_(3)darr+2H_(2)O`
`Ca(OH)_(2)+Na_(2)CO_(3)rarrunderset("or caustic soda")underset("Sodium hydroxide")(2NaOH+caCO_(3))`
`Ca(OH)_(2)+CO_(2)rarrunderset("Milkiness")(CaCO_(3)darr+H_(2)O`
Hence, `(XX)` is `Ca(OH)_(2)`.
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