Question

Magnesium carbonate required double amount of lime for softening

Answer 1

Magnesium carbonate need double the amonut of lime for softening because

1. The pH should be increased for neutralizing the excess hydroxide ions

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Answer 2

Magnesium carbonate required double the amount of lime for softening because:

• MgCo₃ is alkaline in nature, lime is used to neutralize the effect of the base.
• MgCo₃ is an ionic in nature.
• Ionic bonds need more lime to break the bond and neutralize the effect.
• When lime is added to the MgCO₃, the reaction occurs is,

               MgCO₃ + Ca(OH)₂ ⇒ CaCO₃ + Mg(OH)₂

       which is a double displacement reaction.

Hence, Magnesium carbonate required double the amount of lime for softening because it is alkaline in nature.