Analysis of the trace water in anhydrous hydrofluoric acid by the conductivity

Conductivity and Dissociation Equilibrium of Extremely Anhydrous Hydrogen Fluoride

“…We have reported previously the conductivities below 0.01% water concentration in anhydrous hydrogen fluroide (13). We now report that we have measured the conductivity of anhydrous hydrogen fluoride with lower water concentrations and studied theoretically the dissociation of water in extremely anhydrous hydrogen fluoride.…”

“…A limitation of Manuscript submitted Nov. 10,1988; revised manuscript received Aug, 13,1989. Water molecules have been confirmed to dissociate ideally in hydrogen fluoride at water concentrations below 1 • 10 -3 mol dm 3 (18 ppm).…”

Titrations in nonaqueous solvents

“…Among the spectrophotometric methods for determining water are use of the UV spectral shift of the compound pyridinium phenol betaine caused by trace amounts of water (291), measurement of the red color produced on reaction of water with 5-isothiocyanato-l,3-dioxo-2-p-tolyl-2,3-dihydro-lGbenz[de]isoquinoline (233), measurement of the absorbance at 400 nm of the complexes formed between water and EtAlCl2 in methylene chloride (446), and measurement of the water in DMF by its effect on the rate of oxidation of catechol in the presence of sodium periodate (453). Water in nonpolar solvents can be estimated by its effect on the vapor pressure (275,276), in acetone by its effect on the density (33), and in dry HF by the variation in conductivity (336). Water in oils can be estimated from the temperature rise on adsorption of the water by crystalline zeolite 4A (277) or from the heat of reaction between water and Karl Fischer reagent (322).…”