# Using the  E° values of A and B, predict which is better for coating the surface of iron [  E° (Fe2+/ Fe) = -0.44 V ] to prevent corrosion and why ? Given  E° (A2+ / A) = -2.37 V and  E° (B2+ / B ) = -0.14 V

Dear Student,

Please find below the solution to the asked query.

Corrosion is basically a phenomenon of oxidation of iron. Thus, we must consider the oxidation potentials of all the elements. Whichever element A or B has a higher oxidation potential than that of Fe, will oxidise faster than iron (sacrificial oxidation), thus protecting iron from getting corroded.

Oxidation potential of Fe = 0.44 V

Oxidation potential of A = 2.37 V
Oxidation potential of B = 0.14 V

Since, A has a higher oxidation potential than that of iron, it can be used for coating the surface of iron.

Hope this information clears your doubt about this topic. In case of any other doubt, do ask here on the portal and our experts will try to help you out as soon as possible.

Regards

• 67
A is better to prevent crossion because E cel will be negative
• -7
What are you looking for?