Answers

2016-04-14T19:16:38+05:30
Soaps are not suitable for washing clothes with hard water as they form insoluble precipitate on reacting with calcium and magnesium ions of hard water
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2016-04-14T21:15:39+05:30
Almost all over the world even for drinking hard water (includes Calcium & Magnesium) is available and soap has a great limitation that it produces scuum while washing anything in hard water.

Scuum is meant to be insoluble precipitates of Ca²⁺, Mg²⁺, Fe²⁺ etc. It is white in color.
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