Question

Reaction for formation of scum when soap is used in hard water

Answer 1

The soap first reacts with calcium abd magnesium ions to form insoluble precipitate of calcium and magnesium salts of fatty acids which float as an off- white layer over wated. This layer is called scum. When a soap is used in hard water, a solid substance we call scum forms.

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Answer 2

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◾◾here is your answer.

✒Soap does not much useful when the water is hard.

✒Scum formation:--

1) A soap contain sodium or potassium salt of long chain fatty acids. Hard water contains salts of calcium and magnesium.

2)When soap is mix with hard water, calcium and magnesium ions present in water replace by sodium or potassium ions from the soap molecules forming an insoluble substance called scum.

✒ A lot of soap is wasted in the process.

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