Advertisement Remove all ads

Write Electrode Reaction and Net Cell Reaction for Fuel Cell. Calculate E.M.F. of the Following Cell at 25 °C - Chemistry

Write electrode reaction and net cell reaction for fuel cell. Calculate e.m.f. of the following cell at 25 °C.

Standard reduction potential (SRP) of Zn and Cu are − 0.76 V and 0.334 V respectively

Advertisement Remove all ads

Solution

Cell reactions for fuel cell:

1) Oxidation at anode (−):

At anode, hydrogen gas is oxidized to H2O.

2H2(g) + `4OH_(aq)^-` → 4H2O(l) + 4e

2) Reduction at cathode (+):

The electrons released at anode travel to cathode through the external circuit.
Here O2 gas is reduced to OH

O2(g) + 2H2O(l) + 4e → `4OH_((aq))^-`

3) Net cell reaction

The overall cell reaction is the sum of oxidation at anode and reduction at cathode.
Thus,

4) Calculation of e.m.f.:

`E_(Cu)^0` = 0.334 V

`E_(Zn)^0` = −0.76 V

The overall cell reaction is the redox reaction which is the sum of oxidation half reaction at anode and reduction half reaction at cathode.

  Is there an error in this question or solution?
Advertisement Remove all ads

APPEARS IN

Advertisement Remove all ads

Video TutorialsVIEW ALL [1]

Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×