. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . lmitic & stearic acids in the propor-tion of 8 or 9 of Palmitic to 1 of Stearic acid crystallized fromalcohol with a melting point similar to that of Margaric acid,viz. 59-60° C. This mixture gave a refractive index higher than that of Pal-mitic acid and almost identical with that of Margaric viz. The refractive indices of these acids were all determined attemperatures as near as possible to their melting points,—usuallyless than one degree above. xxv] Congress of Applied Ch
. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . lmitic & stearic acids in the propor-tion of 8 or 9 of Palmitic to 1 of Stearic acid crystallized fromalcohol with a melting point similar to that of Margaric acid,viz. 59-60° C. This mixture gave a refractive index higher than that of Pal-mitic acid and almost identical with that of Margaric viz. The refractive indices of these acids were all determined attemperatures as near as possible to their melting points,—usuallyless than one degree above. xxv] Congress of Applied Chemistry 439 It would be interesting to find whether the refraction of otheracids of this series with an odd number of carbon atoms washigher than that of the acid next lower in the series. Solubility in absolute alcohol. The solubilities of the acids inabsolute alcohol (at ° C sp. gr. ) at varyingtemperatures were carefully determined. The alcohol was satur-ated at a few degrees above that at which the observation was tobe made and kept at the temperature of observation for from so. 0° J° JO W £6° 40° d6 40 Temperature. 440 Original Communications: Eighth International [vol. 5 to 6 hours; about 10 of the clear supernatant solution weredrawn off into the weighing bottle, weighed, the alcohol evapor-ated and the residual acid dried to constant weight in an atmos-phere of carbon dioxide. The results are stated in grammes ofacid dissolved in 100 grammes of alcohol. All determinationswere made in duplicate and gave concordant results. The experimental data from which the solubility curves ofPalmitic and Stearic acids in the above diagram were plotted areas follows:— Palmitic acid Stearic acid Temperature Grms. per 100 grms. grms. per 100 grms. alcohol alcohol 0°C ° C .773 ° C . ° C The determinations from which the solubility curve of Margaricacid is drawn
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