First slide

Hardness of water

Question

Permanent hardness of water can be removed by adding

Moderate

A

Na₂CO₃
B

K
C

KO₂
D

K₂O₂

Solution

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

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