Cell Diagram Notation with Pt(s)

[Kyle_Phong_2J]

Assuming we add Pt(s) as a conductor because the reactants are not good electrical conductors, does the cell diagram always have the single line between Pt(s) and the reactants? I thought the single line was only for if there is a phase change, but what if the reactants were also solid?

[mlomas2004]

The single line (|) between Pt(s) and the reactants indicates a phase boundary in a cell diagram. It is commonly used when there is a phase change between the reactants and the electrode material (in this case, Pt(s)). If the reactants are also in the solid state and there is no phase change, you typically represent them directly adjacent to Pt(s) without the single line. The single line is a convention to emphasize a distinct phase boundary rather than a requirement for all solid reactants.