First slide

Hardness of water

Question

Permanent hardness of water can be removed by adding

Easy

A

Na₂CO₃
B

K
C

Ba(OH)₂
D

Cl₂

Solution

${Ca}^{2 +} + {Na}_{2} C O_{3} \overset{}{\to} 2 {Na}^{+} + {CaCO}_{3} ↓$
${Mg}^{2 +} + {Na}_{2} C O_{3} \overset{}{\to} 2 {Na}^{+} + {MgCO}_{3} ↓$

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