Abstract
The applicability of silicone-rubber ion-selective electrodes was studied in mixtures of distilled water with methanol, ethanol, propanol, or isopropanol. The limit of applicability of the electrodes lies at a 90% alcohol concentration in aqueous methanol or ethanol solutions, and at 40% alcohol concentration in aqueous n-propanol or isopropanol solutions. The solubility products of the silver halide salts and the selectivity constants of an iodide-selective electrode for other halide ions were measured in aqueous alcohol solutions. The equation previously derived for potentials in aqueous media involving selectivity constants is also valid in non-aqueous media.
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