pH determination:

pH determination using glass electrode is most accurate and widely used method despite a few drawback viz. the glass membrane being very fragile, it needs great care although using. An ordinary potentiometer cannot be used for measuring the potential of the glass electrode. Therefore, the electronic potentiometers are required to be used, require frequent standardization and will not be employed in pure ethyl alcohol, acetic acid and gelatin. The following features of glass electrode have made it more versatile to be used be as indicator electrode for pH measurement.

• It might be used in the presence of strong oxidizing and reducing solutions in viscous media and in presence of proteins which interfere with operation of other electrodes.
• It could be used for solutions having pH values 2 to 10 with some special glass, measurements can be extended to pH values greater than 10.
• It is easy to immune and operates to poisoning.
• An equilibrium is reached rapidly

While measuring pH you should be little care full as there are few factors that limit the accuracy of pH measurements.