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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
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Solution
Given:
E°(A+2 / A) = 2.37 V
E°(B+2 / B) = -0.14 V
`E_(cell)=E_(cell)^@ - (0.0591)/n log [Cr^(3+)]^2/[Fe^(2+)]^3`
(Nernst Equation)
`0.261 = E_(cell)^@ = 0.0591/6 log [0.001]^2/[0.001]^3`
`0.261 = E_(cell)^@ - (0.591 xx 2)/6`
`E_(cell)^@ = 0.2807V`
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