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The y-axis of a Frost diagram represents the standard reduction potential (E°) of a species relative to the most stable oxidation state of that element. To calculate the y-axis value for a particular species, you need its standard reduction potential (E°) and the standard reduction potential (E°) of the most stable oxidation state. The y-axis value is then calculated as:
y-axis value = E° (species) - E° (most stable oxidation state)