Chemical (A) is used for water softening to remove temporary hardness. (A) reacts with sodium carbonate to generate caustic soda. When \[C{{O}_{2}}\]is bubbled through a solution of (A), it truns cloudy. What is the chemical formula of (A)?

Chemical (A) is used for water softening to remove temporary hardness.

1.	Chemical (A) is used for water softening to remove temporary hardness. (A) reacts with sodium carbonate to generate caustic soda. When \[C{{O}_{2}}\]is bubbled through a solution of (A), it truns cloudy. What is the chemical formula of (A)?
A.	\[CaC{{O}_{3}}\]
B.	\[CaO\]
C.	\[Ca{{(OH)}_{2}}\]
D.	\[Ca{{(HC{{O}_{3}})}_{2}}\]
Answer» D. \[Ca{{(HC{{O}_{3}})}_{2}}\]

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Chemical (A) is used for water softening to remove temporary hardness. (A) reacts with sodium carbonate to generate caustic soda. When \[C{{O}_{2}}\]is bubbled through a solution of (A), it truns cloudy. What is the chemical formula of (A)?

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