Describe briefly the principle and working of the glass electrode. How is the pH of soil measured?

The glass electrode is a crucial component in pH measurement, widely used in environmental chemistry. It operates based on the principles of electrochemical potential and the ion-selective nature of the glass membrane. The key component is a thin glass membrane, usually made of a special glass sensitive to hydrogen ions (H+). This membrane allows ________ ________ ____ ______ _________ ______ ______ ______.
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