First slide

Hardness of water

Question

Temporary hardness may be removed from water by adding

Easy

A

${CaCO}_{3}$
B

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

${CaSO}_{4}$
D

HCl

Solution

$Ca {({HCO}_{3})}_{2} + Ca {(OH)}_{2} \to \underset{ppt .}{2 {CaCO}_{3}} ↓ + 4 H_{2} O$

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