What happens when calcium and magnesium salts are added to a soap solution
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When a soap is used in hard water, a solid substance we call scum forms. This is because charged calcium and magnesium particles (called ions ) present in the water react with soap to form an insoluble substance. Scum builds up on clothes, baths and sinks.
When scum forms, sodium is replaced with a calcium or magnesium particle. The new substance, scum, does not dissolve in water. When a calcium or magnesium particle reacts with a detergent molecule, the new substance does dissolve in water, so there is no scum.
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