Subsequently, question is, what is soap residue? Soap scum is formed into a solid substance when soap is being used in hard water. This is because charged calcium and magnesium particles (called ions ) present in the water react with soap to form an insoluble substance. Soapless detergents When a soap is used in hard water, a solid substance we call scum forms. In this regard, what is the chemical reaction that forms soap scum? 2C17H35COO^- + Ca^2+ => (C17H35COO)2Ca which is insoluble and referred to as scum. but the reaction with soap will not be different between the two, as an insoluble Ca salt of the fatty acid found in soap will form ( scum).
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