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Homework Help: Electrochemistry Exercise: Normal Potential of a Reaction

  1. Jul 13, 2013 #1
    1. The problem statement, all variables and given/known data

    Calculate the normal potential at 25 °C for the reaction:

    HA(aq) + e- → A-(aq) + 1/2H2(g)

    if the dissociation constant of HA is equal to 3.3*10-4

    2. Relevant equations

    ΔG° = -RTlnK ⇔ -ΔG°/nF = RT/(nF)lnK ⇔ E° = RT/(nF)lnK

    3. The attempt at a solution

    Just plugging in the numbers gives the answer E°=-0.206V
    However, the answer key of the textbook disagrees on the sign... Am I overlooking something or is it just a typo? I can't imagine what my mistake could be...
     
  2. jcsd
  3. Aug 19, 2013 #2

    Borek

    User Avatar

    Staff: Mentor

    Typo for me. But I am known to be occasionally wrong.
     
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