Determination of relative acidity scales for some dipolar aprotic solvents by coulometry using a hydrogen-palladium electrode

摘要

хлората или тетрабутиламонщум-перхлората као основног електролита. За мереае полу-неу-трализационих потенциjала киселине и базе коришhени су електродни парови стаклена-ЗКЕ и (Н_2/Рd)_(инд)-ЗКЕ. Применом електродног пара стаклена-ЗКЕ и тетрабутиламонщум-перхло-ратног основног електролита добиjене су веЬе вредности за релативне скале киселости испи-тиваних растварача.%A coulometric-potentiometric procedure for the determination of relative acidity scales of acetone, methylethyl ketone, methyl-isobutyl ketone and propylene carbonate is described. The range of the relative acidity scale of a solvent was determined from the difference between the half-neutralization potential of perchloric acid and that of tetrabutylammonium hydroxide. The perchloric acid was generated in situ from a hydrogen-palladium electrode in presence of sodium perchlorate or tetrabutylammonium perchlorate as the supporting electrolyte. The electrode pairs glass-SCE and (H_2/Pd)_(ind)-SCE were applied for the measurement of the half-neutralization potentials of the acid and base. A wider range of relative acidity scale of the solvents was obtained with the glass-SCE electrode pair and tetrabutylammonium perchlorate as the supporting electrolyte.