Chemical $A$ is used for water softening to remove temporary hardness. $A$ reacts with sodium carbonate to produce caustic soda. When $CO_2$ is passed through a solution of $A$,it turns milky. What is the chemical formula of $A$?
- A$CaCO_3$
- B$CaO$
- C$Ca(OH)_2$
- D$Ca(HCO_3)_2$
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