Discussion
Three of the following are steps in the kettle process for soap. Which is the odd one out?
Answer: C
Correct answer: hydrogenation over nickel
Hydrogenation belongs to oil processing, not to soap making - it saturates double bonds in the oil before any soap is made. The kettle process itself is saponification with caustic, graining out with salt to separate the soap from the glycerine-bearing lye, and fitting to give a clean layer of neat soap above the spent lye.
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