Conductance Studies of Alkali Metal Acetates in Acetic Acid-Acetonitrile Mixtures

Abstract

Conductance behaviour of lithium, sodium and potassium acetates in 20% and 80% acetic acid-acetonitrile mixtures at 35° have been measured. The association constants were evaluated by Fuoss-Hsia equation of 20% acetic acid-acetonitrile mixtures by making use of TDC-12 Computer. Shedlovsky, Fuoss-Kraus extrapolation techniques were also employed to evaluate the association constants for these salts in both the solvent mixtures. The association constants obtained by these three methods were compared. The results were discussed in terms of various theories of ion pair formation i.e., Bjerrum, Fuoss, Denison-Ramsay, and Ebeling, Kraft, Yokoyama and Yamatera. Hydrodynamic radius was also calculated to understand the solvation of ions, in 20% and 80% acetic acid-acetonitrile mixtures.

Key Words:

• Association constant
• ion size
• ion pairs