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kusum (206)

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from nawed to experts,
 
a beaker contains 3 compartments separated by semipermeanble membrane left comp. contains Co(NO3)2 ,Eo(Co2+,Co)= --0.28,middle container contains KNO3 and the right comp. contains AgNO3 Eo=0.8, the conc. and vol. in each comp. is 0.1M,5 lit. and assume current is flowing in this electrolytic cell. find the con. of Co2+ and NO3-in the left compartment. plz show method also
    
nawid (0)

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sum 1 reply

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rajat (284)

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consider the middle compartment to be th salt bridge and solve it

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wherever light goes it always finds that darkness has already got there
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plz can u explain....it also asks about conc. of Co2+ in middle comp.

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smriti.mathur (442)

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Left compartment -
Co  Co2+ + 2e-
Right compartment -
Ag  Ag+ + e-
On adding these half cell reactions we get the cell reaction.
Co + 2Ag2+  2Ag + Co2+
Ecell = E0 cell  -  0.0591/n   * logCo/(Ag+ )2
E0 cell = E0 Ag+, Ag  -  E0 Co2+, Co
   = 0.8 - (-0.28)
   = 1.08
Ecell = 1.08 - 0.0591/2  log 0.1/(0.1)
   = 1.08 - 0.0591/2  log 10
   = 1.08 - 0.0295
   = 1.05
 

Lecturar, Organic Chemistry
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