Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . ed on fats (see p. 100). (cr) Melting-Point.—Determinethe melting-point of palmitic acidby <»ne of the methods given onpages 104 and 105. (d) Formation of TransparentSpot on Paper,—Melt a little ofthe fatty acid and allow a drop tofall upon a piece of ordinary writ-ing paper. How does this com-pare with the action of a fat undersimilar circumstances ? (c) Acrolein Test.—Apply thetest as given under 4, page the result. 9. Saponificati
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . ed on fats (see p. 100). (cr) Melting-Point.—Determinethe melting-point of palmitic acidby <»ne of the methods given onpages 104 and 105. (d) Formation of TransparentSpot on Paper,—Melt a little ofthe fatty acid and allow a drop tofall upon a piece of ordinary writ-ing paper. How does this com-pare with the action of a fat undersimilar circumstances ? (c) Acrolein Test.—Apply thetest as given under 4, page the result. 9. Saponification of Lard.—To (wgj25 grams of lard in a flask add75 of alcoholic-potash solutionand warm upon a water-bath untilsaponification is complete. (Thispoint is indicated by the completesolubility of a drop of the solutionwhen allowed to fall into a littlewater.) Now transfer the solu-tion from the flask to an evapo-rating dish containing about of water and heat on a water-bath until all the alcohol has been driven off. Precipitate the fatty acid with HC1 and cool thesolution. Remove the fatty acid which rises to the surface,. M 1 Apparatus. 104 PHYSIOLOGICAL CHEMISTRY. neutralize the solution with Na2COs and evaporate to the residue with alcohol, remove the alcohol by evapo-ration upon a water-bath and on the residue of glycerin thusobtained make the tests as given below. 10. Glycerin, (a) Taste.—What is the taste of glycerin? (b) Solubility.—Try the solubility of glycerin in water,alcohol and ether. (c) Acrolein Test.—Repeat the test as given under 4, p. 100. (d) Borax Fusion Test.—Fuse a little glycerin on a plat-inum wire with some powdered borax and note the charac-teristic green flame. This color is due to the glycerin esterof boric acid. (e) Fehlings Test.—How does this result compare with theresults on the sugars ? (/) Solution of Cu(OH)2.—Form a little Cu(OH)2 bymixing CuS04 and KOH. Add a little glycerin to this
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