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CH262_2009SPRING_EXAM2_PROFSOLN_[0]

CH262_2009SPRING_EXAM2_PROFSOLN_[0] - CH262 Exam#2 Spring...

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CH262 Exam #2 Spring 2009 Assume the temperature is 298K for all problems. 1. The equilibrium constant for the following cell is K = 6.7x10 -40 . Ag(s)|Ag 2 SO 4 (aq) |PbSO 4 (s)| Pb(s) a. Write the two half cell reactions that make up this reaction b. Calculate the standard cell potential, E o , from the data table of cathode reduction potentials. c. Compare that value to the value you obtain when you calculate E o directly from the equilibrium constant. d. Is this cell galvanic or electrolytic? Explain. 2. What must be the pressure of fluorine gas to produce a reduction potential of 2.75V in a solution that contains 0.5M F - ? 3. Calculate the standard reduction potential of the following half cell reaction, given that the K sp of CrSO 4 at 298K is 10 -6 . CrSO 4 (s) + 2e - = Cr(s) + SO 4 -2 4. The solubility product constant for Ag 2 CrO 4 at 298K is 2 x 10 -12 . a) calculate the solubility of Ag 2 CrO 4 in pure water, ignoring the mean ionic activity coefficient.
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