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Explain the role of lime and washing sod...

Explain the role of lime and washing soda for the removal of permanent hardness of water.

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(i) chemical composition of lime and washing soda
(ii) reasons for the permanent hardness of water
(iii) reaction between components of permanent hard water and lime
(iv) reaction between components of permanent hard water and washing soda
(v) solubility of the products obtained in the above reactions
(vi) relation between the solubility of the products and hardness of water
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