. Journal. way liquids free from more than tracesof soap were obtained, the soap originally containedin the brine before evaporation being thus following corrected mean values were obtainedin a lengthy series of experiments with various sodasoaps, all of which were either neutral or only faintlyalkaline ; the numbers represent the quantities ofNa20 set free by hydrolysis, reckoned per 100 partsof Na„0 contained in the soap combined with fattyacids, x molecules of water being used for one of an-hydrous soap. of these three homologous acids, that for the acid ofhighest molecular w
. Journal. way liquids free from more than tracesof soap were obtained, the soap originally containedin the brine before evaporation being thus following corrected mean values were obtainedin a lengthy series of experiments with various sodasoaps, all of which were either neutral or only faintlyalkaline ; the numbers represent the quantities ofNa20 set free by hydrolysis, reckoned per 100 partsof Na„0 contained in the soap combined with fattyacids, x molecules of water being used for one of an-hydrous soap. of these three homologous acids, that for the acid ofhighest molecular weight underlying, and that for theacid of lowest molecular weight overlying, the cannot, however, be hence inferred that the .sodasalts of acids of the fatty series are decomposed bywater with the greater ease the lower their molecularweight, for Julius Thomsens thermo-ehemical inves-tigations (Thermochemische Untefsuchungen. i. p. 372)show that sodium acetate is not measurably brokenup by kio 2 .1 4 Mhi u : ii ? > 1000 II \2 a l» IM0 18 1) 18 18 2000 Vatlu&i of X The curve for tallow-resin soap (primrose) indicatesthat the presence of a certain amount of resin soapin a mixture mainly consisting of sodium stearateand oleate does not materially affect the rate of hydro-lysis^ since the curve for this soap lies between thestearic and oleic acid curves. Patty Acids. MeanMolecularWeight. Hydrolysis brought about by x Molecules of Water z=150 .r=250 x=500 ,r=1000 a- = 2O0O 281 271280250 071-453751-851-55 . 1-11-5 2-25 1-01-9 4 52-G2-2 1553-0 1-72-65-4383-0 2-63150 2-G315G-45 5-23-8 41427-5 35537571G654-5 535-395 Chiefly Stearic, Palmitic, and Oleic acids(palm-oil tallow soap) Chiefly Tallow and Resin (primrose) The annexed diagram represents these values gra-phically, the value of X being abscissae and the othersordinates. It is noticeable, in connection with these figures,that the curves for stearic, palmitic, and lauric acids(cocoa-nut oil) lie
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
