Primary Reference Electrode Write The Construction And Working Of It. The silver silver chloride reference electrode is composed of a silver wire sometimes coated with a layer of solid silver chloride immersed in a solution that is saturated with potassium chloride and silver chloride. An sce reference electrode with a controlled rate of leakage about 3 μl h is recommended by astm g5 standard.
If hydrogen gas is adsorbed at 1 atm pressure over a platinum electrode dipped at 25 o c in 1 m hcl it is a regular electrode of hydrogen and its potential is e 0 0 volt. This is the primary reference electrode. The potential of reference electrode should be checked at periodic intervals to ensure the accuracy of the reference electrode.
An sce reference electrode with a controlled rate of leakage about 3 μl h is recommended by astm g5 standard.
The electrode whose standard potential is to be determined is coupled with a reference electrode of known potential i e s h e to get a galvanic cell. The potential of reference electrode should be checked at periodic intervals to ensure the accuracy of the reference electrode. The standard reference point for electrochemical potentials is the hydrogen electrode h h2. Using reference electrodes unknown potential of any other single electrode can be found out e g.
