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Question I would like to know the procedure for the determination of total fatty matter in soaps?

Take a weighed sample of soap in a beaker. Dissolve it in a small quantity of water. Add a small quantity of conc. sulfuric acid & start to warm it till soap is converted to oil. Transfer this whole liquid in a separating funnel & allow to stand for about half an hour. Discard the lower layer of water completely. Give more two washes of boiling water in the same manner. Then add a small quantity of petroleum spirit in it & shake it vigorously after giving the stopper on open end(upper) of the separating funnel. Separate out lower layer in other separating funnel & repeat this process for about two times. After that drain this oily layer in a separate dried weighed beaker. The same process should be repeated with other separating funnel in which we have collected the lower layers. Collect the oily layer from that funnel into the same dried & weighed beaker.

Placed this beaker on the water bath till whole of the petroleum spirit is evaporated. Then further dried it in an oven. Weigh the oil in beaker & calculate the %age of oil, this will be TFM( Total Fatty Matters ) in %age.

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Total fatty matter in hair cream can be determined by using a method called the Soxhlet extraction method. In this method, the hair cream is dissolved in an organic solvent and placed in a thimble within a Soxhlet extractor. The solvent is heated, evaporated, and condensed to extract the fatty matter, which is then weighed to determine the total fatty content in the hair cream.

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Q: What is the method of determination of Total Fatty Matter in hair cream?
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