Question

Write about Clark's method.

Answer 1

The hardness of the permanent hard water can’t be removed by boiling.

A calculated amount of Ca (OH)2 ( calcium hydroxide) needs to be added to water, which results in the formation of insoluble carbonates which can be separated from water by filtration.

Ca(HCO3)2 + Ca(OH)2 è 2CaCO3 + 2H2O, Mg(HCO3)2 + Ca(OH)2 è CaCO3 + MgCO3 + 2H2O

Answer 2

Explanation:

Na₂CO₃ is more basic ___