Respuesta :
A standard reference electrode can measure the potential difference between two different electrodes.
What is a standard reference electrode?
A standard reference electrode is an electrode whose potential is known.
It is physically impossible to measure the potential of a single electrode. Because only the difference between the two electrodes' potentials can be measured.
However, a way to measure the potential of different electrodes is to compare the standard cell potentials of two different galvanic cells that have one common electrode. This allows us to measure the potential difference between two different electrodes.
For example, the standard cell potential (E°) for the Zn/Cu is 1.10 V, and E° for the Zn/Co is 0.51 V. So using these values we can determine the potential difference between the Co and Cu electrodes that is 1.10 V − 0.51 V = 0.59 V.
Hence, A standard reference electrode helps to measure the potential difference between two different electrodes.
Learn more about electrode:
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