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26 Jun 2020

Given the electrochemical reaction shown, if the standard reduction potential of Zn2+ -> Zn is –0.76 V, what is the standard reduction potential of Mg2+ -> Mg?

Mg / Mg 2+(aq) // Zn2+(aq) / Zn E˚ = +1.61 V

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Solve problems involving standard cell potentials

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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? =

Use the table of standard reduction potentials to complete the following table. Example is provided:

Electrodes	Half-reactions	E^o	E^o cell
Zn Cu	Zn(s) ---> Zn²⁺ +2e^- Cu²⁺+2e^- ---> Cu (s)	+0.76 V +0.34	+1.10 V
Cu Mg
Cu Fe
Zn Mg
Fe Mg
Zn Fe
Cu Cu

Any explanation/help would be appreciated!

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

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Given the electrochemical reaction shown, if the standard reduction potential of Zn2+ -> Zn is –0.76 V, what is the standard reduction potential of Mg2+ -> Mg?

Mg / Mg 2+(aq) // Zn2+(aq) / Zn E˚ = +1.61 V

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Given the electrochemical reaction shown, if the standard reduction potential of Zn2+ -> Zn is –0.76 V, what is the standard reduction potential of Mg2+ -> Mg? Mg / Mg 2+(aq) // Zn2+(aq) / Zn E˚ = +1.61 V

Unlock all answers

Related textbook solutions

Basic Chemistry

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Principles of Chemistry Molecular Approach

Chemistry: A Molecular Approach

Chemistry: A Molecular Approach

Principles of Chemistry: A Molecular Approach

Chemistry: The Central Science

Related questions

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Given the electrochemical reaction shown, if the standard reduction potential of Zn2+ -> Zn is –0.76 V, what is the standard reduction potential of Mg2+ -> Mg?

Mg / Mg 2+(aq) // Zn2+(aq) / Zn E˚ = +1.61 V