7. Consider a voltaic cell in which the following reaction takes place 2NO3- (aq

Question

7. Consider a voltaic cell in which the following reaction takes place 2NO3- (aq) + 3H2 (g) 2NO (g) + 2OH-(aq) + 2H2O a) Calculate E0 b) Calculate E under the following conditions: [NO3- ] = 0.0315 M, PNO = 0.922 atm, PH2 = 0.437 atm pH = 11.50 7. Consider a voltaic cell in which the following reaction takes place 2NO3- (aq) + 3H2 (g) 2NO (g) + 2OH-(aq) + 2H2O a) Calculate E0 b) Calculate E under the following conditions: [NO3- ] = 0.0315 M, PNO = 0.922 atm, PH2 = 0.437 atm pH = 11.50 7. Consider a voltaic cell in which the following reaction takes place 2NO3- (aq) + 3H2 (g) 2NO (g) + 2OH-(aq) + 2H2O a) Calculate E0 b) Calculate E under the following conditions: [NO3- ] = 0.0315 M, PNO = 0.922 atm, PH2 = 0.437 atm pH = 11.50

Explanation / Answer

a)

2NO3- (aq) + 3H2 (g) 2NO (g) + 2OH-(aq) + 2H2O

Eocell = 0.109 - (- 0.83)

Eocell = 0.939 V

b)

Q = [0.922]^2[3.16 x 10^-3]^2 / [0.0315]^2[0.437]^3

   = 0.1025

Ecell = Eo - 0.05916 / n log Q

        = 0.939 - 0.05916 / 6 log 0.1025

Ecell = 0.949 V

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