Ionization of hydrofluoric acid at 25 C

Abstract
The ionization constant, K 1, for the reaction HF⇄H+ + F- was calculated on the basis of potentiometric measurements in the cell Ag; AgCl, Cl-, F-∥LaF3∥NaF, HCl, H2O∣KCl(Satd.), Hg2Cl2; Hg at 25 °C. A least squares procedure was applied to the experimental data yielding a best estimate for K 1 of 5.85 × 10-4 with a standard error of 0.03 × 10-4.