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A great video lecture conducted by experienced chemistry teacher on 10th class chemistry chapter 15 topic soft and hard water. Get full understanding or ask any questions.

Methods of Removing Hardness, ch 15, lec 15.3, Soft and hard Water - 10th Class Chemistry

23:26

Removal of Permanent Hardness, ch 15, lec 15.3, Soft and hard Water - 10th Class Chemistry

18:32