Consider the following voltaic cell: (a) In which direction do electrons flow in

Question

Consider the following voltaic cell: (a) In which direction do electrons flow in the external circuit? (b) In which half-cell does reduction occur? (c) In which half-cell do elections leave the cell? (d) At which electrode are electrons generated? (e) Which electrode is positively charged? (f) Which electrode increases in mass during cell operation? (g) Suggest a solution for the anode electrolyte. (h) Suggest a pair of ions for the salt bridge. (i) For which electrode could you use an inactive material? (j) In which direction do cations within the salt bridge move maintain charge neutrality? (k) Write balanced half-reactions and the overall cell reaction.

Explanation / Answer

a)

Co2+ + 2 e Co(s) 0.28

Zn2+ + 2 e Zn(s) 0.7618

electrons must flow from the lower potential to higher potential

so

from solid Zinc to aqueous Cobalt

b)

reduction --> gain of electrons, which is Co+2 + 2e- --< Co(s) in the right side (cobalt side)

c)

the electorns leave the Zinc Cell to form Co+2 + 2e- --> Co(s)

d)

electrons are generated from the solid Zinc Zn(s) --> Zn+2 + 2e-

e)

electrode possitive must be the one with the negative charge --> anode

f)

increase of mass is the one reducing, since Co+2 is formid solid Cobalt

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