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Using the E° values of A and B, predict which is better for coating the surface of iron [E°(Fe+2/Fe) = -0.44V] to prevent corrosion and why? - CBSE (Science) Class 12 - Chemistry

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Question

Using the E° values of A and B, predict which is better for coating the surface of iron [E°(Fe+2/Fe) = -0.44V] to prevent corrosion and why?

Given: E° (A+2/A)=-2.37 V: E°(B+2/B)= -0.14V

Solution

 

Given:

E°(A+2 / A) = 2.37 V

E°(B+2 / B) = -0.14 V

`E_(cell)^@=E_`

In 1st case :

`E_`= E° (A2+ / A) - E° (Fe2+ /Fe)

= (-2.37 + 0.44) = -1.93 V

 In 2nd case :

`E_`= E°(B2+/B) - E° (Fe2+/Fe)

=(-0.14 + 0.44) = 0.3 V

As B has a positive value, it will be our choice for electroplating.

 

 

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Solution Using the E° values of A and B, predict which is better for coating the surface of iron [E°(Fe+2/Fe) = -0.44V] to prevent corrosion and why? Concept: Electrolytic Cells and Electrolysis - Introduction.
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