Abstract
1. The acidity function H0 of aqueous solutions of HCl (up to 9.33%) at 50°C was measured by the indicator method (indicators-4- and 2-nitroanilines). It was shown that the H0 of these solutions at 25 and 50°C are equal for the same HCl content in the solution. 2. The ionization of 4-nitroaniline was studied in aqueous-ethanol solutions of HCl at 16.35; 25.32; 54.27% EtOH at 50°C. It was found that as at 25°C, the acidity functions of the aqueous and aqueous-ethanol solutions of HCl are equal at the same concentration of the acid, expressed on molar ratios scale m. A standard state for each composition of the solvent is an infinitely dilute solution of an acid in this solvent.
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