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ID: 881669 • Letter: U
Question
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A voltaic cell is constructed in which the anode is a Pb|Pb2+ half cell and the cathode is a Hg|Hg2+ half cell. The half-cell compartments are connected by a salt bridge.
The anode reaction is:
The cathode reaction is:
The net cell reaction is:
In the external circuit, electrons migrate _____(from/to) the Pb|Pb2+ electrode _____(from/to) the Hg|Hg2+ electrode.
In the salt bridge, anions migrate _____fromto the Pb|Pb2+ compartment _____(from/to) the Hg|Hg2+ compartment.
B.
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The cathode reaction is:
In the external circuit, electrons migrate _____(from/to) the Hg|Hg2+ electrode _____(from/to) the I-|I2 electrode.
In the salt bridge, anions migrate _____(from/to) the I-|I2 compartment _____(from/to) the Hg|Hg2+ compartment.
Explanation / Answer
(A)
Anode reaction : Pb(s) ------------> Pb2+(aq) + 2e-
Cathode reaction : Hg2+(aq) + 2e- -----------> Hg(l)
The net cell reaction : Pb(s) + Hg2+(aq) ----------> Pb2+(aq) + Hg(l)
In the external circuit, electrons migrate from the pB/Pb2+ electrode to the Hg/Hg2+ electrode.
In the salt bridge,anions migrate to the Pb/Pb2+ compartment from the Hg/Hg2+ compartment.
(B)
Anode reaction : 2I-(aq) ----------> I2(s) + 2e-
Cathode reaction : Hg2+(aq) +2e- ----------> Hg(l)
Net cell reaction : 2I-(aq) + Hg2+(aq) ---------> I2(s) + Hg(l)
In the external circuit, electons migrate to the Hg/Hg2+ electrode from the I-/I2 electrode.
In the salt bridge, anions migrate to the I-/I2 compartment from the Hg/Hg2+ compartment.
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