30 Ch19-3 Concentration&amp;Electrolytic Cells

30 Ch19-3 Concentration&amp;Electrolytic Cells -...

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1 Permanganate is a powerful oxidizing agent. This reduction reaction will cause all the others below it to reverse and run as oxidations to produce a decrease in the free energy. 2 Alkali metals are powerful reducing agents. These reduction reactions reverse, run as oxidations, and cause all the others above them to run as reductions to produce a decrease in the free energy. Since the standard reduction potential is negative, the standard oxidation potential is positive.

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3 Identifying oxidizing and reducing agents based on chemical properties (position in the Periodic Table). Which is the stronger reducing agent? A) K in Group 1 B) Ca in Group 2 Which is the stronger oxidizing agent? A) Cl 2 in Group 17, Period 3 B) I 2 in Group 17, Period 5 Ca is more electronegative K is more electropositive Both in Period 4. Cl 2 is more electronegative 4 Chapter 19 Electrochemistry Lec 30, pp. 959 – 970 Nernst equation Concentration cells Electrolysis (Electrolytic Cells) Homework QRT 19: 24,56,58,61,69,71,77
Determining G o and K from measurements of the standard cell potential, E o cell G o = - nFE o Recall from Ch 18 that G o = - RT ln(K) Combine these two equations -nFE o = -RT ln(K) E o = (RT/nF) ln(K) Substitute values for R, F, T = 298 K, and convert to base 10 logs. E o cell = (0.0592 V/n) log (K) 6 Practice on problems 19.9, p. 945 E o cell = (0.0592 V/n) log (K) Determine the equilibrium constants for the following reactions from the standard reduction potentials in Table 19.1. Fe(s) + Cu

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30 Ch19-3 Concentration&amp;Electrolytic Cells -...

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