Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Pork Fat. Neutral oli\e oil may be prepared by shaking ordinary olive oil with a10 per cent solution of sodium carbonate. This mixture should then beextracted with ether and the ether removed by evaporation. The residueis neutral olive oil. IQ2 PHYSIOLOGICAL CHEMISTRY. the crystals under the microscope and compare them withthose reproduced in Figs. 35, 36 and 37 on pp. 96, 99 and Saponification of Bayberry Tallow.—Fill a large cas-serole two
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . Pork Fat. Neutral oli\e oil may be prepared by shaking ordinary olive oil with a10 per cent solution of sodium carbonate. This mixture should then beextracted with ether and the ether removed by evaporation. The residueis neutral olive oil. IQ2 PHYSIOLOGICAL CHEMISTRY. the crystals under the microscope and compare them withthose reproduced in Figs. 35, 36 and 37 on pp. 96, 99 and Saponification of Bayberry Tallow.—Fill a large cas-serole two-thirds full of water rendered strongly alkaline withsolid KOH (a stick one inch in length). Add about 10 gramsof bayberry tallow and boil, keeping the volume constant byadding water as needed. AVhen saponification is complete1add concentrated HC1 slowly until no further precipitate isproduced. Cool the solution and the precipitate of free fattyacid will rise to the surface and form a cake. In this in-stance the fatty acid is principally palmitic acid. Remove thecake, break it into small pieces, wash it with water by decanta- Fig. Palmitic Acid. tion and transfer to a small beaker by means of 95 per centalcohol. Heat on a water-bath until the palmitic acid is dis-solved, then filter through a dry filter paper and allow thefiltrate to cool slowly in order to obtain satisfactory the reactions which have taken place in this the palmitic acid has completely crystallized filter 1 Place 2 or 3 drops in a test-tube full of water. If saponification iscomplete the products will remain in solution. FATS. I03 Fig. 39. o& off the alcohol, dry the crystals between filter papers and trythe te>t> given below. 8. Palmitic Acid.— (a) Examine the crystals under themicroscope and compare them with those shown in Fig. 38,opposite. (b) Solubility.—Try the solubility of palmitic acid in thesame solvents as used on fats (see p. 100). (cr) Melting-Point.
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