Question

How are electrode potential measured ?
(40 words)

Answer 1

Explanation:

In order to avoid false or irreproducible results you should only measure the emf (without current flow) of an electrochemical cell completed with a typical reference electrode in a solution which contains an Ion which can pass the phase boundary to your composite electrode. Without any charge transfer species you will not get a reproducible emf. For serious data a potentiostat is a must. Drawing current through a reference electrode may damage it. But without using a difficult to polarize reference electrode it is not clear at which electrode which potential drop is created during current flowing through the electrochemical cell.

Answer 2

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It is measured with the help of a reference electrode known as the standard hydrogen electrode (abbreviated to SHE). The electrode potential of SHE is 0 Volts. The standard electrode potential of an electrode can be measured by pairing it with the SHE and measuring the cell potential of the resulting galvanic cell.