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13 Dec 2019

Problem 17.56

The standard potential for the following galvanic cell is 0.40 V:
Zn(s)|Zn2+(aq)||Eu3+(aq), Eu2+(aq)|Pt(s)
(Europium, Eu, is one of the lanthanide elements.)

Part A

Calculate the standard reduction potential for the Eu3+/Eu2+ half-cell, if
Zn2+(aq)+2e??Zn(s), E? = -0.76 V

Express your answer using two decimal places.
E? = V

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Trinidad Tremblay
Trinidad TremblayLv2
17 Dec 2019

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Related questions

Consider the following table of standard reduction potentials.

Half-reaction E o (V)
Cu2+(aq) + 2e? ? Cu(s) +0.34
Pb2+(aq) + 2e? ? Pb(s) -0.126
Cd2+(aq) + 2e? ? Cd(s) -0.403
Zn2+(aq) + 2e? ? Zn(s) -0.76


Based on these values, which of the following choices represents the correct combination of cell reaction and standard cell potential?

Cu2+(aq) + Cd(s) ? Cu(s) + Cd2+(aq), +0.06 V
Cu2+(aq) + Zn(s) ? Cu(s) + Zn2+(aq), ?0.42 V
Pb2+(aq) + Cd(s) ? Pb(s) + Cd2+(aq), +0.53 V
Pb2+(aq) + Zn(s) ? Pb(s) + Zn2+(aq), +0.63 V

Standard reduction potentials

Reduction half-reaction E∘ (V)
Ag+(aq)+e−→Ag(s) 0.80
Cu2+(aq)+2e−→Cu(s) 0.34
Sn4+(aq)+4e−→Sn(s) 0.15
2H+(aq)+2e−→H2(g) 0
Ni2+(aq)+2e−→Ni(s) −0.26
Fe2+(aq)+2e−→Fe(s) −0.45
Zn2+(aq)+2e−→Zn(s) −0.76
Al3+(aq)+3e−→Al(s) −1.66
Mg2+(aq)+2e−→Mg(s) −2.37

Part A

Use the table of standard reduction potentials given above to calculate the equilibrium constant at standard temperature (25 ∘C) for the following reaction:

 

Express your answer numerically.

Part B

Calculate the standard cell potential (E∘) for the reaction

 

if K = 3.04×10−3.

Express your answer to three significant figures and include the appropriate units.

Standard reduction potentials for zinc(II) and copper(II)

The standard reduction potential for a substance indicates how readily that substance gains electrons relative to other substances at standard conditions. The more positive the reduction potential, the more easily the substance gains electrons. Consider the following:

Zn2+(aq)+2e−→Zn(s),Cu2+(aq)+2e−→Cu(s), E∘red=−0.763 V E∘red=+0.337 V

Part B

What is the standard potential, E∘cell, for this galvanic cell? Use the given standard reduction potentials in your calculation as appropriate.

Express your answer to three decimal places and include the appropriate units.

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