Answer to Question #56950 in Chemistry for emma

Question

What is the half-reaction for the reduction of oxygen that occurs with the corrosion of iron? Using this reaction, explain why corrosion occurs more slowly in dry climates

Answer 1

Half-reaction for the reduction of oxygen:
O² + 4e- + 4H+ → 2H²O E₀^O/4OH-=+1.23 V
As we have seen in the reactions involving hydrogen ions. Supplier of hydrogen ions is water. With an increase pH to 9-10, corrosion reaction practically stops. Therefore, the reaction occurs in the presence of oxygen dissolved in water, the water takes on the role of the electrolyte.