Electrolytic conductances and related properties of solutions of some acids and salts in acetone
type: CreativeWork
description: Although a thorough investigation of various methods of preparing pure, anhydrous acetone has been made (cf. Sadie), no investigations of methods for determining the moisture content of this solvent have previously been described. A solvent with a consistently low water content is essential for electrochemical measurements. Accordingly an extensive study of moisture content determination in acetone-was made. A modified Karl Fischer titration procedure was found to be most suitable for the very low moisture contents of the acetone used in this work. All A.C. conductance measurements made using two platinised electrodes are, in some degree, liable to errors due to polarization, end effects and the state of the electrode surfaces. Several workers have also found errors due to the presence of finely divided platinum, such as adsorption of electrolyte on the colloidal platinum, the shaking effect and catalysis of reactions in solution. These errors are reduced by using lightly platinised or bright platinum electrodes, but polished electrodes give rise to increased polarization errors. In this work conductance measurements were made using a new four-electrode A.C. potentiometer, which employs bright platinum electrodes enabling conductance measurements to be carried out in acetone without recourse to platinisation, thus avoiding errors due to the presence of platinum black, contact resistances of electrodes and the like. The measurements on this apparatus were shown to be independent of frequency using aqueous potassium chloride solutions, and the accuracy of the results was tested using aqueous sodium chloride solutions. Perchlorates have been considered by some investigators (e.g. Ross Kane) to be strong electrolytes in acetone solutions and other workers (e.g. Accascina and Schiavo) found the alkali perchlorates to be weak electrolytes. The approximate limiting ionic conductances calculated by these last named workers were at variance with those of other investigators …
abstract: Although a thorough investigation of various methods of preparing pure, anhydrous acetone has been made (cf. Sadie), no investigations of methods for determining the moisture content of this solvent have previously been described. A solvent with a consistently low water content is essential for electrochemical measurements. Accordingly an extensive study of moisture content determination in acetone-was made. A modified Karl Fischer titration procedure was found to be most suitable for the very low moisture contents of the acetone used in this work. All A.C. conductance measurements made using two platinised electrodes are, in some degree, liable to errors due to polarization, end effects and the state of the electrode surfaces. Several workers have also found errors due to the presence of finely divided platinum, such as adsorption of electrolyte on the colloidal platinum, the shaking effect and catalysis of reactions in solution. These errors are reduced by using lightly platinised or bright platinum electrodes, but polished electrodes give rise to increased polarization errors. In this work conductance measurements were made using a new four-electrode A.C. potentiometer, which employs bright platinum electrodes enabling conductance measurements to be carried out in acetone without recourse to platinisation, thus avoiding errors due to the presence of platinum black, contact resistances of electrodes and the like. The measurements on this apparatus were shown to be independent of frequency using aqueous potassium chloride solutions, and the accuracy of the results was tested using aqueous sodium chloride solutions. Perchlorates have been considered by some investigators (e.g. Ross Kane) to be strong electrolytes in acetone solutions and other workers (e.g. Accascina and Schiavo) found the alkali perchlorates to be weak electrolytes. The approximate limiting ionic conductances calculated by these last named workers were at variance with those of other investigators …
author: Brookes, Hugh Clive
language: eng
date published: 1966
date modified: 2026-07-22T22:23:31Z
provider: University of Cape Town
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Department of Chemistry

PropertyValue
property ID: Handle
value: http://hdl.handle.net/11427/13519