1) The cathode reaction is: ALSO, please choose FROM or TO for the following! In
ID: 511972 • Letter: 1
Question
1)
The cathode reaction is:
ALSO, please choose FROM or TO for the following!
In the external circuit, electrons migrate _____(from/to) the Pb|Pb2+ electrode _____(from/to) the I-|I2 electrode.
In the salt bridge, anions migrate _____(from/to) the Pb|Pb2+ compartment _____(from/to) the I-|I2 compartment.
2)
A voltaic cell is constructed in which the anode is a Fe2+|Fe3+ half cell and the cathode is a Br-|Br2 half cell. The half-cell compartments are connected by a salt bridge.
(Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
The anode reaction is:
The cathode reaction is:
The net cell reaction is:
Explanation / Answer
1) oxidation takes place at the anode
so
Anode reaction :
Pb (s) ---> Pb+2 (aq) + 2e-
cathode reaction :
I2 (s) + 2e- ---> 2I- (aq)
a) from , to
b) to , from
2)
oxidation takes place at anode
anode reaction :
Fe+2 (aq) ---> Fe+3 (aq) + e-
reduction takes place at cathode
Cathode reaction :
Br2 (l) + 2e- ---> 2 Br- (aq)
net cell reaction :
2 Fe+2 (aq) + Br2 (l) --> 2 Fe+3 (aq) + 2 Br- (aq)
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