ELECTRICAL CONDUCTIVITY OF ALKALI SOLUTIONS OF SODIUM TUNGSTATE AND SODIUM MOLYBDATE

摘要

The dependence of the specific electrical conductivity (x) of alkali (NaOH) solutions of sodium tungstate and sodium molybdate on their composition and temperature is studied using the method of multifactor experiment design. Mathematical models that relate the quantity x of the corresponding solutions with the content in the solutions of MeO_3 (10-150 g/dm~3) and NaOH (20-200 g/dm~3) and temperature (20-70 deg C) are obtained. Conditions that ensure a maximum of x in an investigated region of the factor space are determined from the model using the method of nonlinear programming. The Kohlrausch formula is used to describe the temperature dependence of x. Models of the dependence of the specific electrical conductivity at t = 25 deg C and the temperature coefficient on the composition of the solutions are proposed in order to extend the data to solutions possessing other compositions.