CHEM-002 Lecture Notes - Lecture 25: Electrolytic Cell, Galvanic Cell, Space Diagonal

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chocolatedeer31

22 Apr 2017

School

Georgetown University

Department

Chemistry

Course

CHEM-002

Professor

Dedios Angel

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Document Summary

E0 = ecat ean = 0. 08v - - 1. 66 v = 2. 46 v. E0 = ecat ean = -0. 28v - - 0. 76 v = 0. 48 v. When you put two cells in series, you add the potential. When you change a galvanic cell into an electrolytic cell, chose the one with the higher potential to work as the galvanic cell and the other to work as the electrolytic cell. The zn/ni cannot power the al/ag, but the al/ag can power the zn/ni. So now you have al/al3+ // ag+/ag (2. 46v) and ni/ni2+ // zn2+/zn (-0. 48v) switch the sign of the potential because the reaction is going the other way. E total = 2. 46 + (-0. 48) = 1. 98 v. The ne(cid:396)nst e(cid:395)uation is what we use if you"(cid:396)e not under standard conditions standard conditions are when all dissolved species are at 1m and gases are at 1atm.

Related Questions

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.

lemongnat815

Reduction half-reaction	Eâ (V)
Ag+(aq)+eââAg(s)	0.80
Cu2+(aq)+2eââCu(s)	0.34
Sn4+(aq)+4eââSn(s)	0.15
2H+(aq)+2eââH2(g)	0
Ni2+(aq)+2eââNi(s)	â0.26
Fe2+(aq)+2eââFe(s)	â0.45
Zn2+(aq)+2eââZn(s)	â0.76
Al3+(aq)+3eââAl(s)	â1.66
Mg2+(aq)+2eââMg(s)	â2.37

Use the table of standard reduction potentials given above to calculate the equilibrium constant at standard temperature (25 âC) for the following reaction: Fe(s)+Ni2+(aq)âFe2+(aq)+Ni(s)

Calculate the standard cell potential (Eâ) for the reaction

X(s)+Y+(aq)âX+(aq)+Y(s)

if K = 3.80Ã10^â4.

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

Standard reduction potentials

Reduction half-reaction	Eâ (V)
Ag+(aq)+eââAg(s)	0.80
Cu2+(aq)+2eââCu(s)	0.34
Sn4+(aq)+4eââSn(s)	0.15
2H+(aq)+2eââH2(g)	0
Ni2+(aq)+2eââNi(s)	â0.26
Fe2+(aq)+2eââFe(s)	â0.45
Zn2+(aq)+2eââZn(s)	â0.76
Al3+(aq)+3eââAl(s)	â1.66
Mg2+(aq)+2eââMg(s)	â2.37

Part A

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

Fe(s)+Ni2+(aq)âFe2+(aq)+Ni(s)

Express your answer numerically.

Part B

Calculate the standard cell potential (Eâ) for the reaction

X(s)+Y+(aq)âX+(aq)+Y(s)

if K = 3.04Ã10^â3.

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

CHEM-002 Lecture Notes - Lecture 25: Electrolytic Cell, Galvanic Cell, Space Diagonal

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