Question

Using `E_"values"^°` of X and Y given below, predict which is better for coating the surface of iron to prevent corrosion and why?

Given:

`E_(X^(2+)//X)^°` = −2.36 V, 

`E_(Y^(2+)//Y)^°` = −0.14 V, 

`E_(Fe^(2+)//Fe)^°` = −0.44 V

Answer 1

The oxidation potentials of all elements must be considered, as corrosion involves the oxidation of iron. Iron won’t corrode because an element with a higher oxidation potential than iron will oxidize more quickly than iron.

According to the information provided, the oxidation potential of `E_(Fe^(2+)//Fe)^° = −0.44 V, E_(X^(2+)//X)^° = −2.36 V, and E_(Y^(2+)//Y)^° = −0.14 V`.

`E_(X^(2+)//X)^°` can be utilized to coat the surface of iron since it has a higher oxidation potential than iron.