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If soap has high alkali content it irritates skin. How can the amount of excess alkali be determined? What can be the source of excess alkali?
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Acid-base titration can be used to determine the excess amount of alkali in soap. A soap solution is titrated with standard hydrochloric acid, phenolphthalein is used as an indicator. The source of this excess alkali is the alkali left unused when the soap is prepared by hydrolysis of fat.
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