ピリヂンの一新定量法について (第2報)

Abstract

Studies were made on the method of quantitatively determining the content of pyridine in a mixture of pyridine and α-picoline. To 1cc. of this mixture, 5cc. of butanol was added as a solvent, cooled with ice-water, and 72% solution of perchloric acid was added dropwise with methyl orange as the indicator. The crystals of pyridinium perchlorate thus formed is in direct proportion to the concentration of pyridine in the sample and, between 100-20% of pyridine, the yield of perchlorate was in an average of 97.4% of the theoretical value. The amount of pyridine in the original sample is calculated by: x=100w/2.17 or x=46.1w where w is the weight (in g.) of perchlorate obtained by actual determination and x is the concentration (in %) of pyridine in the original sample. Ethanol, benzene, toluene, gasoline (b.p. 150-160°) and isoamyl alcohol were also used as solvents but were found to be unsuitable for quantitative determination.