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    Siobhan634's Avatar
    Siobhan634 Posts: 3, Reputation: 1
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    #1

    Oct 21, 2013, 05:18 AM
    Nernst Equation Question (voltage)
    What is the voltage for a cell constructed of Ni(s) in 1.0 x 10-7M Ni+2 and Ag(s) in 1.0 x 10-5 M Ag+?
    Celine91's Avatar
    Celine91 Posts: 51, Reputation: 9
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    #2

    Oct 21, 2013, 08:17 AM
    The Nernst Equation: Ecell = Estandard - (RT/nF)lnQ
    at 298 k ( assuming T = 25 deg. ) : Ecell= Estandard - (0.05916 /n)ln Q

    n: number of electrons in half cell and Q is reaction quotient of initial concentrations.

    for you question:
    Ni2+ (aq) + 2e– —> Ni(s) Ehalf-cell = –0.257 V oxidation
    2Ag+(aq) + 2e– —> 2Ag(s) Ehalf-cell = +0.80 V reduction

    ==> Ecell = (0.8 - (-0.257)) - (0.05916 / 2) * ln ([Ni2+]/[Ag+]^2)
    Ecell = (1.057) - (0.05916/2) * ln (1.0 x 10-7/(1.0 x 10-5)^2) = 0.8526
    Ecell = 0.8526 volts
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