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Homework Help: Electrochem question

  1. Nov 16, 2007 #1
    1. The problem statement, all variables and given/known data

    E1,2 = constant + [(b×0.05916)/(n)] log(a1 + k1,2×a2^2)

    b= electromotive efficiency (which is equal to 1)
    a1 the activity of the primary species
    a2 activity of the interferring species
    k1,2 selectivity coefficient corresponding to the relative response of the interferring species to the primary

    I want to find the value of the 'constant' for determination of Ca2+ activity in the presence of Na+
    I already found out the activity of Ca2+ and Na+ to be 0.0069 and 0.012 respectively in the previous questions. I know the b=1, and n=2 (charge of Ca2+) and E was given to be 239.2mV.
    what I don't get is how to get the k1,2

    how can I calculate the value of the constant if I don't have k1,2
  2. jcsd
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