Question

Determine the equilibrium constant, Keq, at 25°C for the reaction 2Br– (aq) + I2(s) Br2(l) +...

Determine the equilibrium constant, Keq, at 25°C for the reaction 2Br– (aq) + I2(s) Br2(l) + 2I– (aq)

5.7 ? 10–19 is the correct answer

Can someone explain how they got this answer

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Homework Answers

Answer #1

The reaction

    2Br - (aq) + I2 (s) Br2(l) + 2I - (aq)

The standard reduction potentials of the half-cell reactions are followings

Br2 (l) + 2e- 2Br-(aq) E0 = +1.07V

I2(s) + 2e- 2I -(aq)    E°= +0.53V

Overall

2Br - (aq) + I2 (s) Br2(l) + 2I - (aq)

We know,

E0cell   =  E0cathode - E0anode
E0cell = +0.53V - 1.07V

E0cell = -0.54V

We know

E0cell = (0.0592/n) log K (K is the equilibrium constant)

log K = (-0.54*2)/(0.0592)

K = 5.7 *10-19(Answer)

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