Why are detergent better than soap to cleaning action
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Soaps work in soft water. However, they are not effective in hard water. In contrast, synthetic detergents work both in soft water and hard water.
Synthetic detergents are used in the case of hard water also because the calcium and magnesium salts of detergents are soluble in water.
The cleaning action of soap is very effective in soft water because it contains negligible calcium and magnesium ions.
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It detergent forms lot of lather even with hard water . Hard water contains ions which react with soap to form insoluble salts of calcium and magnesium called scum and soap goes waste . Detergents do not form insoluble compounds with ions therefore these are more effective.
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