Glass electrode
![A silver chloride reference electrode (left) and glass pH electrode (right)](/Images/godic/202501/15/Zilverchloridereferentie-_en_PH-glaselektrode3130.jpg")
![Scheme of the typical dependence E (Volt) – pH for ion-selective electrode.](/Images/godic/202501/15/PH_graph3130.jpg")
![Scheme of typical pH glass electrode.](/Images/godic/202501/15/Glass_electrode_scheme_2.svg3130.png")
A glass electrode is a type of ion-selective electrode made of a doped glass membrane that is sensitive to a specific ion. The most common application of ion-selective glass electrodes is for the measurement of pH. The pH electrode is an example of a glass electrode that is sensitive to hydrogen ions. Glass electrodes play an important part in the instrumentation for chemical analysis and physico-chemical studies. The voltage of the glass electrode, relative to some reference value, is sensitive to changes in the activity of certain type of ions,