#9 quiz 11b A galvanic cell consists of compartment with zinc electrode in conta
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Question
#9 quiz 11b
A galvanic cell consists of compartment with zinc electrode in contact with 0.1 M Zn(NO3)2(aq) and another compartment with a lead electrode in contact with 1 x 10-3 M Pb(N)O3(aq). The relevant reduction potentials are: Pb2+ + 2e- - > Pb E degree = -0.13 V Zn2+ + 2e- - > Zn E degree = -0.77 V When this cell is allowed to discharge spontaneously at 25 degree C, which of the following statements is true? The concentration of zinc ion will decrease as the reaction proceeds. Pb2+ ions will be reduced to Pb metal. The concentration of lead(II) ions in the left compartment will increase. The lead electrode will be the anode.Explanation / Answer
From the reduction potential of 2 half cells we can tell which is anodic reaction and which is cathodic reaction.
the more negative one will be the anodic reaction in reverse.
Zn compartment is anode and pb2+ is cathode
Zn ---->Zn2+ +2e- (anode)
as the reaction proceeds Zn is converted to Zn2+, Zn concentration decreases
Pb2+ +2e- ----->Pb (cathode)
yes Pb2+ is converted to pb metal
other 2 statements are wrong
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