1. The voltage generated by the zinc concentration cell described by, Zn(s)|Zn2

Question

1. The voltage generated by the zinc concentration cell described by,

Zn(s)|Zn2 (aq, 0.100 M)||Zn2 (aq, ? M)|Zn(s) is 24.0 mV at 25 C. Calculate the concentration of the Zn2 (aq) ion at the cathode.

2. A galvanic (voltaic) cell consists of an electrode composed of aluminum in a 1.0 M aluminum ion solution and another electrode composed of copper in a 1.0 M copper(II) ion solution, connected by a salt bridge. Calculate the standard potential for this cell at 25 °C. Standard reduction potentials can be found here.

Explanation / Answer

1. Ecell = - 0.0592/n log [Zn2+ (0.100 M)]/ Zn2+(x)

24.0 mV = - 0.0592/2 log [0.100 M]/ [x]

-log [0.100 M]/ [x] = [ 24.0 x 10-3 V x 2÷ 0.0592]

log [x]/ [0.100 M] = 0.811

[x]/ [0.100 M] = 6.47

[x]= [0.100 M] 6.47 = 0.647 M

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