Explain the formation of scum when hard water is treated with soap.??
Answers
Soap does not work properly when the water is hard. A soap is a sodium or potassium salt of long chain carboxylic acids. Hard water contains salts of calcium and magnesium. When soap is added to hard water, calcium and magnesium ions, which are present in hard water, readily react with the carboxylate ion of the soap to form insoluble substance called scum. A lot of soap is wasted in the process.
Hello ..
Soaps are sodium or potassium salts of higher fatty acids. Hardness in water is due to the presence of Ca^2+ and Mg^2+ ions, present as their salts. The soap first reacts with calcium and magnesium ions to form insoluble precipitate of calcium and magnesium salts of fatty acids which float as an off- white layer over water this layer is called scum....
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