申論題

5. pE-pH diagram is a useful tool to predict chemical state of species in water. The following figure is a typical pE-pH diagram for iron in water at the total soluble iron concentration of 1 x M.

(A) Calculate the values of , pE, and pH at the point in following figure where is at a concentration of 1 x M, and Fe(OH)₂ and Fe(OH)₃ are all in equilibrium. (10%)