Science for Beginners a First book in General Science for Intermediate Schools
The book Science for Beginners a First book in General Science for Intermediate Schools was written by author Delos Falls Here you can read free online of Science for Beginners a First book in General Science for Intermediate Schools book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Science for Beginners a First book in General Science for Intermediate Schools a good or bad book?
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To make a hard soap a soda lye (caustic soda, or NaOH) is used. This is purchased by the farmer's wife as " concentrated lye, " and the chemist keeps it in a purified form on his shelf. In making hard soap the soda lye and fat are first boiled together, and when the contents of the kettle have become thoroughly united, a strong solution of common salt is added and the mixture is heated again. Then the boiling is stopped and the kettle is left standing for several hours. The contents of the kett...le separate into two portions, the upper consisting of soap and the lower containing the excess of salt, glycerin, and all im- purities. The soap thus produced is hard soap. The glycerin is separated from the water and is used in medicine. When glycerin is treated with nitric acid it becomes nitroglycerin, used in making dynamite* and other explosives. Free alkali in soap. In the making of soaps on a large scale, great care is taken to use the lye and the fat in exactly the right proportions, to avoid an excess of either fat or lye.
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