problem set 2 - disproportionate in acidic conditions? In...

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Chemistry 312 Please turn in on your own paper and individually. Problem Set 2 (Due Friday, July 8, 2011) 1. Answer the following questions about the Pourbaix diagram shown below a. Is MnO 4 a stronger oxidant at pH 8 or pH 2? Explain your choice. b. Is MnO 2 (s) easier to reduce at pH 2 or pH 10? How do the half- reactions differ at pH 2 vs. pH 10? Write a balanced equation for each. c. What reaction occurs across the line labeled “a”? Is this a redox reaction? Give a justification. d. What reaction occurs across the line labeled “b”? Is this a redox reaction? Give a justification. e. What reaction occurs across the line labeled “c”? Is this a redox reaction? Give a justification. f. What reaction occurs across the line labeled “d”? Is this a redox reaction? Give a justification. 2. a. Write balanced half-reactions for all of the redox steps shown in the Latimer diagram below.
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b. Which of the Mn species shown in the Latimer diagram above would tend to
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Unformatted text preview: disproportionate in acidic conditions? In basic conditions? c. Determine the redox potential for MnO 4 conversion to MnO 4 3 at pH 14. Be careful to include units . d. Determine the redox potential for MnO 4 conversion to Mn 3+ at pH 0. e. Determine the redox potential for MnO 4 conversion to Mn 3+ at pH 6. 3. Answer the following questions about the Frost diagram below. a. What is the most stable oxidation state of manganese under acidic conditions? How can you tell? b. What is the redox potential at which Mn 2+ is converted Mn to under acidic conditions? Explain whether Mn would be a good reductant or a good reductant. c. What is the redox potential at which HMnO 4 is converted H 2 MnO 4 to under acidic conditions? Explain whether HMnO 4 would be a good oxidant or a good reductant. Acidic cond....
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This note was uploaded on 01/19/2012 for the course CHEM 312 taught by Professor Staff during the Summer '08 term at University of Washington.

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problem set 2 - disproportionate in acidic conditions? In...

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