SDS Volume (3790)

Volume 69. Ternary Alcohol-Hydrocarbon-Water Systems, p None

Original Measurements

Fuoss, R. M.; J. Am. Chem. Soc. 65, 78 (1943).

Variables:

Room Temp: 303 $\pu{K}$

Prepared by:

A. Skrzecz

Method/Apparatus/Procedure:

The conductance method (set A) was used to obtain compositions along the saturation curve. Weighed mixtures of about 150 g of toluene and butanol in glass-stoppered Erlenmeyer flasks were placed in a thermostat and portions of water, containing a trace (<0.5%) of HCI, were added. As long as water dissolves in the organic phase, its conductance increases. With the appearance of an aqueous phase the conductance of the organic phase drops on further addition of water, because the aqueous phase extracts HCI from the organic phase. Set B and set C present the compositions of the saturated organic phase used for refractive index (on an Abbe refractometer) and density (in 25 mL pyknometer) measurements. The refractive index and density of binary butanol-water mixtures were measured in similar way. Solubility of toluene in the butanol-water mixture was estimated to be about 0.03% and its effect on density and refractive index of aqueous phase was assumed to be negligible. Large scale plots of composition functions for refractive index and density were used to determine the compositions of phases in equilibrium. To determine equilibrium, the mixture of three components were shaken together and after separation samples of both phases were taken for density and refractive index measurements.

Source and Purity of Materials:

1. Source not specified, c.p. products; distilled; densities and refractive indexes were in agreement with "International Critical Tables".
2. Source not specified, c.p. products; distilled; densities and refractive indexes were in agreement with "International Critical Tables".
3. Not specified.

Estimated Errors:

Ambient temperature: Not reported.
Mass concentration (m/v) (1): Not reported.