4. Consider the Latimer diagram shown below for Cr (acidic solution): E° = ? +0.55 +1.34 +2.10 -0.424 -0.90 Cr,0,2- Crs+ Cr+ Cr3+ Cr2+ Cr (a) Calculate the value of E° for the indicated redox couple (Cr20,2- → Cr3*). Show all work, including balanced half-reactions. (b) Indicate which Cr species, if any, are unstable to disproportionation under acidie conditions.

4. Consider the Latimer diagram shown below for Cr (acidic solution): E° = ? +0.55 +1.34 +2.10 -0.424 -0.90 Cr,0,2- Crs+ Cr+ Cr3+ Cr2+ Cr (a) Calculate the value of E° for the indicated redox couple (Cr20,2- → Cr3*). Show all work, including balanced half-reactions. (b) Indicate which Cr species, if any, are unstable to disproportionation under acidie conditions.

Chemistry: An Atoms First Approach

2nd Edition

ISBN:9781305079243

Author:Steven S. Zumdahl, Susan A. Zumdahl

Publisher:Steven S. Zumdahl, Susan A. Zumdahl

Chapter17: Electrochemistry

Section: Chapter Questions

Problem 64E

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The cell Ag|AgCl(sat’d)||H+(a = x)|glass electrode has a potential of —0.2094 V when the solution in the right-hand compartment is a buffer of pH 4.006. The following potentials are obtained when the buffer is replaced with unknowns: (a) —0.2806 V and (b) —0.2132 V. Calculate the pH and the hydrogen ion activity of each unknown. (c) Assuming anuncertainty of 0.001 Vin the junction potential, what is the range of hydrogen ion activities withinwhich the true value might be expected to lie?
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Halide ions can he deposited at a silver anode, the reaction being Ag(s) + X- AgX(s) +e- Suppose that a cell was formed by immersing a silver anode in an analyte solution that was 0.0250 M Cl-,Br-, and I -ions and connecting the half-cell to a saturated calomel cathode via a salt bridge. (a) Which halide would form first and at what potential? Is the cell galvanic or electrolytic? (b) Could I- and Br- be separated quantitatively? (Take 1.00 l0-5 M as the criterion for quantitative removal of an ion.) If a separation is feasible, what range of cell potential could he used? (c) Repeat part (b) for I- and Cl-. (d) Repeat part (b) for Br- and Cl-.
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