First slide

Hardness of water

Question

Correct set among the following
A) Mg(HCO₃)₂ + 2Ca(OH)₂ → 2CaCO₃ + Mg(OH)₂ + 2H₂O : Clark’s method
B) M⁺² + Na₄P₆O₁₈^2– → [Na₂MP₆O₁₈]^2– + 2Na⁺ : Calgon’s method
C) 2NaZ + M⁺² → MZ₂ + 2Na⁺ : Ion exchange method
D) 2RNa + M⁺² → R₂M + 2Na⁺ : Synthetic resin method

Easy

A

Only A,B
B

Only A,B,C
C

Only B,C,D
D

A,B,C,D

Solution

All the statements are correct
→ Clark's method is used to removeTemporary hardness of water.
→ Calgon's method, Ion exchange method & synthetic resin methods are used to remove premanent hardness of water.

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