approaching that of NaIO:1 but is exceeding it by a larger amount than in more dilute solutions.The behavior of p-toluenesulfonic acid and sodium p-toluenesulfonate resembled more closely that of HC1 and NaCl, but in the more concentrated solutions there is evidence of incomplete ionization of the acid. The difference in partial molal volumes of the acids and corresponding salts at 4.0m is 2.1 ml for the chlorides but only 1.4 ml for the toluenesulfonates. A degree of ionization of 0.94 has been calculated of p-toluenesulfonic acid at 4.0m.
Vapor-liquid equilibrium relationships of four binary systems containing dioxane were measured at atmospheric pressure without using any analytical instrument. The dew-bubble point method was used for the systems methanol-dioxane and ethanol-dioxane. For other systems, benzene-dioxane and ethyl acetates-dioxane/ the bubble-condensation point method was applied in the present investigation. The experimental dew, bubble and condensation point temperatures were measured by using a flow-type apparatus. As a result, a minimum azeotrope was observed in the ethanol-dioxane system. The other three binary systems measuredwere nonazeotropic.
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