Abstract

Stability quotients for the hydrogen-fluoride and aluminum-fluoride systems in NH 4NO 3 were determined from measurements of free fluoride ion concentration by the lanthanum fluoride membrane electrode. Stability quotients at 0·5, 0·3, 0·1, and 0·01 M ionic strength were extrapolated to infinite dilution through the Debye-Hückel equation to obtain thermodynamic stability constants at 25°C for HF, HF 2 −, AlF 2+, AlF 2 +, AlF 3, and AlF 4 −.

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