Chapter 17: Problem 16
(a) Describe the phenomenon of dynamic equilibrium as it applies to oxidation and reduction electrochemical reactions. (b) What is the exchange current density?
Chapter 17: Problem 16
(a) Describe the phenomenon of dynamic equilibrium as it applies to oxidation and reduction electrochemical reactions. (b) What is the exchange current density?
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Get started for freeDemonstrate that (a) the value of \(\mathscr{F}\) in Equation \(17.19\) is \(96,500 \mathrm{C} / \mathrm{mol}\), and (b) at \(25^{\circ} \mathrm{C}\) \((298 \mathrm{~K})\) $$ \frac{R T}{n \mathscr{F}} \ln x=\frac{0.0592}{n} \log x $$
An electrochemical cell is constructed such that on one side a pure nickel electrode is in contact with a solution containing \(\mathrm{Ni}^{2+}\) ions at a concentration of \(3 \times 10^{-3} M\). The other cell half consists of a pure Fe electrode that is immersed in a solution of \(\mathrm{Fe}^{2+}\) ions having a concentration of \(0.1 M\). At what temperature will the potential between the two electrodes be \(+0.140 \mathrm{~V} ?\)
(a) Briefly explain the difference between oxidation and reduction electrochemical reactions. (b) Which reaction occurs at the anode and which at the cathode?
The corrosion rate is to be determined for some divalent metal M in a solution containing hydrogen ions. The following corrosion data are known about the metal and solution: \begin{tabular}{rr} \hline \multicolumn{1}{c}{ For Metal \(M\)} & For Hydrogen \\ \hline\(V_{\left(M M^{2}+\right)}=-0.47 \mathrm{~V}\) & \(V_{\left(\mathrm{H}^{+} / H_{2}\right)}=0 \mathrm{~V}\) \\ \(i_{0}=5 \times 10^{-10} \mathrm{~A} / \mathrm{cm}^{2}\) & \(i_{0}=2 \times 0^{-9} \mathrm{~A} / \mathrm{cm}^{2}\) \\ \(\beta=+0.15\) & \(\beta=-0.12\) \\ \hline \end{tabular} (a) Assuming that activation polarization controls both oxidation and reduction reactions, determine the rate of corrosion of metal \(\mathrm{M}\left(\mathrm{in} \mathrm{mol} / \mathrm{cm}^{2} \cdot \mathrm{s}\right)\) (b) Compute the corrosion potential for this reaction.
Briefly explain why cold-worked metals are more susceptible to corrosion than noncoldworked metals.
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