Analytical Chemistry cell voltage with SHE / Saturated Silver/Silver Chloride

Question

A cell voltage measured using a saturated calomel reference electrode is -0.774 V. What would the cell voltage be with a saturated silver/silver chloride reference electrode? With a standard hydrogen electrode? In all, assume the reference electrode is at the black (-) lead.

Steps on how to solve a question like this?

Answer 1

To answer this question you need to know the standard reduction potentials for the other reference electrodes.

For example, a silver/silver chloride electrode is 0.197 V in reference to the standard hydrogen electrode (SHE). Therefore if a cell voltage is measured to be 0.35 V vs. SHE, we add 0.197 V to 0.35 V to convert the voltage to a silver/silver chloride electrode. The same logic can be used for your question. We can look up that a saturated calomel reference electrode is 0.241 V for SHE. Which means that to convert for saturated calomel to SHE we need to add 0.241 V

See this page: https://en.wikipedia.org/wiki/Reference_electrode#:~:text=A%20reference%20electrode%20is%20an,changes%20at%20the%20two%20electrodes.