E = E0 + AlgCNernst's EquationA lg[1.00*10^(-4)/1.00*10^(-5)] = 0.208 - 0.180A = 0.0280.028lg[1.00*10^(-4)/x] = 0.208 - 0.195 = 0.013x = 3.43*10^(-4)