Question

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'?

Answer 1

The chemical formula of A is $Ca(OH)_{2}$

Explanation:

Calcium Hydroxide is used to remove temporary hardness from the water. It is not used in the removal of permanent hardness of water because it precipitates the Calcium Trioxocarbonate (IV) which is insoluble in pure water.

Calcium carbonate generates the caustic soda and calcium carbonate while reacts with sodium carbonate. Caustic soda also called sodium hydroxide. When calcium hydroxide is reacted with carbon dioxide, it forms insoluble white precipitation called calcium carbonate then it becomes cloudy.

Answer 2

A is Ca(OH)2

Calcium Hydroxide is used to remove temporary hardness from the water. It is not used in the removal of permanent hardness of water because it precipitates the Calcium Trioxocarbonate (IV) which is insoluble in pure water.

Calcium carbonate generates the caustic soda and calcium carbonate while reacts with sodium carbonate. Caustic soda also called sodium hydroxide. When calcium hydroxide is reacted with carbon dioxide, it forms insoluble white precipitation called calcium carbonate then it becomes cloudy.