Using the standard reduction potentials listed in Appendix E in the textbook, ca

Question

Using the standard reduction potentials listed in Appendix E in the textbook, calculate the equilibrium constant for each of the following reactions at 298 K.

Part A Part complete
Fe(s)+Ni2+(aq)?Fe2+(aq)+Ni(s)
Express your answer using two significant figures.
K =   
2.6×10^5 Correct

Part B
Co(s)+2H+(aq)?Co2+(aq)+H2(g)
Express your answer using two significant figures.

K =    ?

Part C
10Br?(aq)+2MnO?4(aq)+16H+(aq)?2Mn2+(aq)+8H2O(l)+5Br2(l)
Express your answer using two significant figures.

K =    ?

Explanation / Answer

Part B
Co(s)+2H+(aq) ------------> Co2+(aq)+H2(g)

Eocell = Eored - Eooxidation

          = 0.00 - (- 0.28)

         = 0.28 V

delta Go = -n F Eocell

- R T ln K = - n F Eocell

- 8.314 x 10^-3 x 298 x ln K = - 2 x 96485 x 0.28

K = 3.0 x 10^9

Part C
10Br- (aq)+ 2 MnO4-(aq)+16H+(aq)------------> 2Mn2+(aq)+8H2O(l)+5Br2(l)

Eocell = 1.507 - 1.07

           = 0.437 V
delta Go = - n F Eocell

- RT ln K = - n F Eocell

- 8.314 x 298 x ln K = - 10 x 96485 x 0.437

K = 8.1 x 10^73

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