Frost diagram
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A Frost diagram a.k.a an Oxidation State Free Energy Diagram (O.S.F.E) is used in electrochemistry to illustrate the relative stability of a number of different oxidation states of a particular substance. Frost diagrams will be different at different pHs so the pH must be specified. On a Frost diagram the element is generally set as the reference point at 0 Volts. The lower a point is on the Frost Diagram, the more stable it is. This indicates the most stable oxidation state for that element. Points found high in the upper right indicate an element that will act as a strong oxidizing agent at that oxidation state.
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