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(C) $Ca(OH)_2$ is used to remove temporary hardness of water by reacting with calcium bicarbonate: $Ca(OH)_2 + Ca(HCO_3)_2 	o 2CaCO_3 + 2H_2O$ It rea

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$Ca(OH)_2$

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(C) $Ca(OH)_2$ is used to remove temporary hardness of water by reacting with calcium bicarbonate: $Ca(OH)_2 + Ca(HCO_3)_2 	o 2CaCO_3 + 2H_2O$ It reacts with sodium carbonate to produce caustic soda $(NaOH)$: $Ca(OH)_2 + Na_2CO_3 	o 2NaOH + CaCO_3$ It reacts with $CO_2$ to form calcium carbonate,which makes the solution milky: $Ca(OH)_2 + CO_2 	o CaCO_3 \downarrow + H_2O$ Therefore,$A$ is $Ca(OH)_2$.

Chemical $A$ is used for the removal of temporary hardness of water. Compound $A$ reacts with $Na_2CO_3$ to produce caustic soda. When $CO_2$ gas is passed through $A$,it turns milky. What is the chemical formula of $A$?

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