Problem: 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.

FREE Expert Solution

The Nernst Equation at 25°C:


Ecell = E°cell - (0.05916 V n)logQ

Ecell = cell potential under non-standard conditions
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.

Zn2+(aq) + 2 e- → Zn(s)                     

Zn(s) → Zn2+(aq) + 2 e-         
 __________________

Zn(s) + Zn2+(aq)→ Zn2+(aq) + Zn(s)

# of e- transferred = n = 2 e-



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Problem Details

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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