First slide

Hardness of water

Question

Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When ${CO}_{2}$ is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A

Easy

A

${CaCO}_{3}$
B

CaO
C

$Ca {(OH)}_{2}$
D

$Ca {({HCO}_{3})}_{2}$

Solution

$Ca {(OH)}_{2}$ is used for the softening of temporary hard water.
$Ca {(OH)}_{2} (aq) + {CO}_{2} (g) \to \underset{cloudiness}{{CaCO}_{3} (s)} + H_{2} O (l)$

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