Can we use soap and detergents to detect hardness of water
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Yes, we can use them to detect hardness of water. Soaps do not form foam with hard water and form white ppt, while detergents form foam with hard water as well.
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Detergents can't be used to detect whether the water is hard or not as detergents work in both hard and soft water. But yes, Soaps can be used to to determine the hardness of water.
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