Explain construction and working of a reference electrode which is used in pH meter.
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A reference electrode is used in combination with a glass electrode so that the difference in potential generated between it and the glass electrode can be measured. It also indicates a known potential irrespective of the pH of the solution.
Most often used pH electrodes are glass electrodes.Typical model is made of glass tube ended with small glass bubble.Inside of the electrode is usually filled with buffered solution of chlorides in which silver wire covered with silver chloride is immersed.