ISSN 1070-4272, Russian Journal of Applied Chemistry, 2008, Vol. 81, No. 9, pp. 1549!1553. + Pleiades Publishing, Ltd., 2008.
Original Russian Text + V.P. Yurkinskii, E.G. Firsova, O.V. Chechulina, A.M. Soboleva, 2008, published in Zhurnal Prikladnoi Khimii, 2008, Vol. 81,
No. 9, pp. 1474!1478.
AND CORROSION PROTECTION OF METALS
Electrical Conductivity of Lithium Chloride Solutions
in the System Isopropyl Alcohol!Water
V. P. Yurkinskii, E. G. Firsova, O. V. Chechulina, and A. M. Soboleva
St. Petersburg State Polytechnic University, St. Petersburg, Russia
Received April 23, 2008
Abstract-Electrical conductivity of lithium chloride solutions in the system isopropyl alcohol3water in
the temperature range 2903323 K was studied. The dependences of the specific and molar electrical con-
ductivity of the solutions on the concentration of water and lithium chloride were determined.
Solutions of lower aliphatic alcohols find increas-
ing use in technology .
The physicochemical properties of alcohols
strongly depend on the concentration of dissolved
water in them . Therefore, the development of
an express method for the determination of water
concentration in alcohol solutions is a topical prob-
lem. One of such methods is conductometric analysis
[6, 7]. To develop a conductometric method for
the determination of water concentration in water3
alcohol solutions, it is necessary to have data on
their electrical conductivity. Data on the electrical
conductivity of aqueous3organic electrolytes are
available from the literature. However, the effect of
water concentration on this quantity is poorly
In this study we examined the electrical conduc-
tivity of lithium chloride solutions in the system iso-
propyl alcohol3water in relation to the temperature
and salt concentration.
The study was performed in the temperature
range 17350oC. The electrical conductivity of solu-
tions was determined conductometrically. We used
a U-shaped capillary electrochemical cell (capillary
diameter 1.0 mm, length 537 cm). The electrodes
were made of nickel. The electrical resistance of
solutions at a frequency of 1 kHz was measured with
an automated 7-15 ac bridge. The cell was heated
at a rate of 15 deg h
. In measuring the solution
resistance, heating was stopped for a short time to
stabilize temperature. The temperature was meas-
ured with an accuracy of +0.1oC.
Anhydrous LiCl and isopropyl alcohol were of
chemically pure grade. To remove traces of mois-
ture, lithium chloride was additionally dried at
200oC for 4 h, placed into a hermetic container, and
stored in a desiccator.
Lithium chloride solutions in isopropyl alcohol3
water mixtures were prepared by mixing a calculated
amount of lithium chloride or its concentrated aque-
ous solution (40 wt %) with isopropyl alcohol.
The concentration of lithium chloride was varied in
the range 0.04530.25 M, and the concentration of
water in the mixtures, from 0 to 50 vol %. In some
experiments, the concentration of lithium chloride in
the solutions under study was monitored by flame
The experimental data were used to calculate the
specific electrical conductivity c (S cm
) of solutions
under study and to obtain the temperature depen-
dences c = B(6) and the isotherms c = B(?
varied concentration of water in a water3alcohol
The specific electrical conductivities of the solu-
tions corresponding to various temperatures and
lithium chloride concentrations at a water concen-
tration of 5.0 and 50 vol % are given in Table 1 as
Table 1 shows that the specific electrical conduc-
tivity increases with the lithium chloride concentra-
tion and temperature at a constant concentration of
water and with the water concentration in a solution.