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A Frost diagram for sulfur in a basic solution would depict the relative thermodynamic stability of various sulfur species as a function of their oxidation states. The most stable species will be located at the lowest point on the diagram. In a basic solution, sulfur can exist in various oxidation states, including sulfide (S²⁻), sulfite (SO₃²⁻), sulfate (SO₄²⁻), and elemental sulfur (S). Determining the most stable species requires knowledge of the relevant reduction potentials and their dependence on pH. The Frost diagram will show which species is most thermodynamically favored under basic conditions.