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Updated: May 28, 2025
The above solution of mercury iodo-chloride acts on both free unsaturated acids and glycerides, producing addition products.
"The milk was bad to start with, and was drugged to conceal the fact. These carbonates sometimes work very unevenly, and I presume this particular can of milk got more than its share of the doctoring. "There are almost no glycerides," remarked Peter, wishing to hold the doctor till he should have had time to think. "No," said the doctor. "It was skim milk."
When these fats and oils, often called glycerides, are heated with alkali, soda, a true salt of the fatty acid and soda is formed, and this is the soap, whilst the glycerin remains behind in the "spent soap lye." The mixture of soap and glycerin produced from the fat and soda is therefore treated with brine, a process called "cutting the soap."
Animal fats, absorb comparatively less halogen than vegetable fats, and the power to combine with iodine increases with the transition from the solid to the liquid state, and attains its maximum with vegetable oils the method being adapted to the examination of fat mixtures containing glycerides and free saturated fatty acids, provided that substances which under similar conditions combine with iodine are absent.
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