电动势法测定HCl溶液γ_±的改进

An Improvement of Determination of the Mean Ionic Activity Coefficient of the Hydrochloric Acid by an e. m. f. Method

通常用氢电极及Ag-AgCl电极与一定质量摩尔浓度的HCl溶液所构成的电池测定HCl溶液的活度系数.使用氢电极必须有许多预防措施,否则将会降低它的效力.由于玻璃电极对氢离子活度较敏感,因此可用它代替上述电池的氢电极进行测量.用氢电极测定HCl溶液的平均活度系数是费事的,玻璃电极的使用提供了一个快速、简便的测量方法.

The activity coefficients of HCl are usually determined with the cell which consists of hydrogen and silver-silver chloride electrodes in hydrochloric acid at molatity designated (m) as the electrolyte. 1 he many precautions which must be taken while working with this electrode reduce its effectiveness for using. Since the glass electrode is responsive to hydrogen ion activity, it can be used to replace the hydrogen electrode in the above cell. Classical methods of determining the mean ionic activity coefficient of the hydrochloric acid with hydrogen electrode are Laborious. The use of glass electrode affords a fast simple method for making this measurement.