The Nernst Equation at 25°C:
Ecell = cell potential under non-standard conditions
E°cell = standard cell potential
n = number of e- transferred
Q= reaction quotient = [products]/[reactants]
When writing a cell notation, we use the following format – “as easy as ABC”
Get the overall reaction by balancing the number of electrons transferred then adding the oxidation half-reaction and reduction half-reaction.
2 e- → Zn(s)
Zn(s) → Zn2+(aq) +
Zn(s) + Zn2+(aq)→ Zn2+(aq) + Zn(s)
# of e- transferred = n = 2 e-
The voltage generated by the zinc concentration cell described by,
Zn(s)|Zn2+(aq, 0.100 M)||Zn2+(aq, ? M)|Zn(s)
is 23.0 mV at 25°C. Calculate the concentration of the Zn2 + (aq) ion at the cathode.
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