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.The effect of temperature upon t he electrical resbtance and pH response h as bee n studied on elec trodes prepared from t hree types of g lasses: P yrex 7740, commercia l softglass .tubing, and Corning 015 ; glasses of low, intermediate, and high hygroscop icity, respectively. The r esults show t ha t e lectrica l resistance is not the dete rminant in most cases of vol tage departure from t he t heo retical, and in t he inherent fai lure of many glasses to act as satisfactory indicators of hyd rogen-ion activity of aq ueo us solu t ions. FOI' examp le, t he elect rod es prepared from Pyrex glass gave no signifi can t pH response even when t he resistance was as low as 12 megohm s. The resul ts of e lectrodes from glasses of in te rm edia te hygroscopicity gave a pseudo-correspondence of pH response with resistance whereas electrodes of Corning 015 gave voltage depart ures that co uld in no way be a tt ribu ted to the electri cal resistance of t he e lectrode . .

Effect of temperature on the electrical resistance and voltage departures (errors) of glass electrodes, and upon the hygroscopicity of glass