A voltaic cell is constructed from a standard I 2 | I - half cell (E° red = 0.53
ID: 1006337 • Letter: A
Question
A voltaic cell is constructed from a standard I2|I- half cell (E°red = 0.535V) and a standard Pb2+|Pb half cell (E°red = -0.126V).
The anode reaction is:
The cathode reaction is:
The spontaneous cell reaction is:
The cell voltage is V.
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A voltaic cell is constructed from a standard Cu2+|Cu half cell (E°red = 0.337V) and a standard Br2|Br- half cell (E°red = 1.080V).
The anode reaction is:
The cathode reaction is:
The spontaneous cell reaction is:
The cell voltage is V.
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A voltaic cell is constructed from a standard Cu2+|Cu+ half cell (E°red = 0.153V) and a standard Hg2+|Hg half cell (E°red = 0.855V).
The anode reaction is:
The cathode reaction is:
The spontaneous cell reaction is:
The cell voltage is V.
Explanation / Answer
AnodePb+2 +2e- ------>Pb Eo=-0.13V ( Oxidation)
reversing it Pb--------> Pb+2 +2e- Eo= 0.13V (1)
2e- + I2 --> 2I- Cathode ( reduction ) Eo= 0.54V (2)
Addition of the above reactions give Pb+ 2I- -------> Pb+2 +I2 Eo= 0.54+0.13= 0.67V
2. Cu+2 +2e-------->Cu Anode reaction Eo= 0.337
reversiing it gives Cu ----> Cu+2 +2e- Eo= -0.337 V
2Br- +2e--------> Br2 cathode Eo= 1.07
addition gives Cu +2Br- ------> Cu+2 + Br2 Eo= -0.34+1.07=0.73V
3.
Cu ------> Cu+2 +2e- Anode reaction ( oxidation) Eo= -0.34V
Hg+2 +2e- -----Hg Eo= 0.85V and addition gives Cu+ Hg+2---------> Cu+2 + Hg Eo= 0.85-0.34= 0.51V
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