First slide

Water and Heavy water

Question

Temporary hardness of water can be removed by

Moderate

A

simple boiling
B

adding lime or slaked lime
C

boiling with washing soda
D

all of these

Solution

Reactions, For (a) : $Ca {({HCO}_{3})}_{2} \overset{Δ}{\to} {CaCO}_{3} ↓ + H_{2} O + {CO}_{2}$
$Mg {({HCO}_{3})}_{2} \overset{Δ}{\to} Mg ({OH}_{2}) ↓ + 2 {CO}_{2}$
For (b) : $Ca {({HCO}_{3})}_{2} + Ca {(OH)}_{2} \overset{}{\to} 2 {CaCO}_{3} ↓ + 2 {CO}_{2}$
$Mg {({HCO}_{3})}_{2} + 2 Ca {(OH)}_{2} \overset{}{\to} Mg {(OH)}_{2} ↓ + 2 {CaCO}_{3} + 2 H_{2} O$
For (c) : $M^{2 +} ({Ca}^{2 +} {or Mg}^{2 +}) + C O_{3}^{2 -} \overset{}{\to} {MCO}_{3} ↓$

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