……………..is used in the preparation of soaps and detergents.
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The common alkalis used in soap-making are sodium hydroxide (NaOH), also called caustic soda; and potassium hydroxide (KOH), also called caustic potash.
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Hot caustic alkali solution,such as caustic soda ( sodium hydroxide) acts on natural fats or oil, such as tallow or vegetable oil, to produce sodium fatty acid salt ( soap) and glycerin( or glycerol) . This saponification reaction is the basis for all soapmaking..
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