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26 Jun 2020

Find the cell potential of a galvanic cell based on the following reduction half-reactions at 25 °C
Cd2+ + 2 e- → Cd   E0 = -0.403 V
Pb2+ + 2 e- → Pb   E0 = -0.126 V
where [Cd2+] = 0.020 M and [Pb2+] = 0.200 M.

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AP Chemistry
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Solve problems involving cell potentials under nonstandard conditions
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Related questions

Given: Fe3+(aq) + e- ? Fe2+(aq) E? = +0.771 V
Pb2+(aq) + 2 e- ? Pb(s) E? = -0.126 V

Calculate the standard cell potential for the cell based on thereaction below and predict whether the reaction can occurspontaneously under standard conditions.


Pb2+(aq) + 2 Fe2+(aq) ? 2 Fe3+(aq) + Pb(s)

a. E? = -0.897 V, nonspontaneous
b. E? = -0.897 V, spontaneous
c. E? = +0.897 V, nonspontaneous
d. E? = +0.897 V, spontaneous

Which electrochemical reaction is spontaneous in a galvanic cell?

Ni2+(aq) + Cu(s) --> Ni(s) + Cu2+(aq)

Cr3+(aq) + Au(s) --> Cr(s) + Au3+(aq)

Cu2+(aq) + Co2+(aq) --> Cu+(aq) + Co3+(aq)

Cu2+(aq) + Sn(s) --> Cu(s) + Sn2+(aq)

Which electrochemical reaction is non-spontaneous in an electrolytic cell?

F2(g) + 2Cl-(aq) --> 2F-(aq) + Cl2(g)

Ag+(aq) + Fe2+(aq) --> Ag(s) + Fe3+(aq)

Co2+(aq) + Pb(s) --> Co(s) + Pb2+(aq)

Mn2+(aq) + Ba(s) --> Mn(s) + Ba2+(aq)

Which electrochemical reaction is the most spontaneous, generating the highest cell voltage?

F2(g) + 2Cl-(aq) --> 2F-(aq) + Cl2(g)

Ag+(aq) + Fe2+(aq) --> Ag(s) + Fe3+(aq)

Mn2+(aq) + Ba(s) --> Mn(s) + Ba2+(aq)

Cu2+(aq) + Sn(s) --> Cu(s) + Sn2+(aq)

Given the following notation for a galvanic cell diagram

Cd(s) │ Cd2+(aq) ║ Pb2+(aq) │ Pb(s)

Which one correctly represents the electrochemical reaction taking place in the galvanic cell?

Cd(s) + Pb2+(aq) --> Cd2+(aq) + Pb(s)

Cd2+(aq)+ Pb2+(aq) --> Cd(s)+ Pb(s)

Cd2+(aq) + Pb(s) --> Cd(s) + Pb2+(aq)

Cd2+(aq) + Pb2+(aq) --> Cd(s) + Pb2+(s)

Consider a Galvanic cell constructed from the following half cells, linked by a KCl salt bridge.

. an Al(s) electrode in 0.5 M Al2(SO4)3 solution

. a Pb(s) electrode in 1.0 M Pb(NO3)2 solution

Which electrode is the cathode?

Al

Pb

Al3+

Pb2+

A standard galvanic cell is constructed in which a Cd2+ | Cd half cell acts as the cathode. Which of the following statements are correct?

Hint: Refer to a table of standard reduction potentials.

Cd2+ : -0.403 Fe3+ : 0.771

(Choose all that apply.)

___As the cell runs, anions will migrate from the Cd2+|Cd compartment to the other compartment.

___Cd is oxidized at the cathode.

___In the external circuit, electrons flow from the Cd2+|Cd compartment to the other compartment.

___Cd2+ is reduced at the cathode.

___The anode compartment could be Fe3+|Fe2+.

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