Referring to the Pourbaix diagram for iron, list equilibrium reactions corresponding to lines separating:

a$)Fe$ and $F{e}_3{O}_4$

b$)F{e}_3{O}_4$ and $F{e}_2{O}_3$

c$)F{e}^{+2}$ and $F{e}_2{O}_3$

Calculate slopes del$\frac{E}{d}$elnH in each case and compare with the diagram.