Consider a galvanic cell that is set up under standard conditions and allowed to

Question

Consider a galvanic cell that is set up under standard conditions and allowed to react. How many of the following responses are true? 1. The mass of the anode electrode will decrease as the galvanic cell approaches being "dead" 2. The salt bridge acts as a second pathway for electrons to flow thereby "completing" the electrical circuit 3. The half reaction with the higher standard reduction potential will be found in the cathode portion of the cel 4. Electrons are produced spontaneously at the anode electrode 5. Electrons will flow from the anode half cell to the cathode half cell

Explanation / Answer

Answer

Except 2 all are true statements

1) Mass of the anode ectrode will decrease as the galvanic cell approaches being dead

3) The half reaction with higher standard reduction potential will be found in cathode portion

4) Electrons are produced spontaneosly at anode electrode

5) Electrons will flow from anode half to the cathode half cell.

Explanation

Consider Daniell cell

Zn|ZnSO4(aq) ||CuSO4(aq)|Cu

Oxidation half cell (at anode)

Zn(s) - - - - - - > Zn2+(aq) + 2e E°red = - 0.76V

Reduction half cell(at cathode)

Cu2+(aq) + 2e - - - - - > Cu(s) E°red = +0.34V

E°cell = E°red, cathode - E°red, anode

E°cell = +0.34V - (-0.76V)

E°cell = + 1.10V

Salt bridge is not conducting electrons but it coducting ions to get electrical neutrality in aquous solution.

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