
%0 Journal Article
%A Mctigue, P 
%A Odonnell, TA 
%A Verity, B 
%T The Determination of Fluoride-Ion Activities in Moderately Concentrated Aqueous Hydrogen-Fluoride
%J Australian Journal of Chemistry
%D 1985/12/01
%V 38
%N 12
%P 1797-1807
%K 
%R https://doi.org/10.1071/CH9851797
%U https://www.publish.csiro.au/paper/CH9851797 
%X A lead-lead chlorofluoride electrode has been used to determine fluoride ion activities, aF-, in 0-6 M aqueous HF. Our data show that aF- increases, passes through a maximum and then decreases with increasing HF concentration. The conductivities of concentrated HF- water mixtures have also been measured. Both the conductometric and potentiometric data are used in the development of a quantitative model of the equilibria existing between fluoride ions and HF molecules in the solutions studied. The data support the view that the ions (HF)2F-, (HF)3F- and (HF)4F- are important species in moderately concentrated aqueous HF. 
