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Can you use soaps and synthetić detergen...

Can you use soaps and synthetić detergents to check the hardness of water?

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Soaps and detergents can be used to check. the harduess of water. Soaps in hardwater forms. curdy white precipitate'with 'Ca^7 t ' and 'Mg^prime *' ions present in lhard water whiereas no such precipiiates are formed by detergents in hard watcr.
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