Interpretation: to calculate cell potential under standard and non- standard condition
Conceptual Introduction: Electrode potential is the ability of the electrode to attract or to lose the electron when it is in contact with solution possessing its own (similar) ions.
There are three conditions in this:
a) When atom or ion receives no gain or loss of electrons, these are know as null electriode
b) When metal looses an electrons, these is called oxidation electrode.
c) When metal ion is reduced, this are called reduction potential.
Solutions:Cell potential in standard condition:
Cell potential in non-standard condition:
Explanation of Solution
Cell potential in standard condition:
Measurement of standard electrode potential of
Electrode consisting of zinc rod is dipped in the solution of
The sign of standard electrode potential of
Cell potential in non-standard condition:
Nernst equation is calculated at non- standard conditions.
It connects electrode potential to the temperature of the electrode and concentration of species involved.
Nernst equation of reduction electrode is:
E= reduction potential of electrode assembly
R = gas constant =
T =temperature of electrode assembly
F = one faraday =96500 coulombs
n= Number of moles of electrons gained by one mole of the oxidised state get changed into reduced state in the process of reduction occurring at the electrode.
[Oxidised state] = concentration of the substance undergoing reduction
[Reduced state] = concentration of the substance obtained on reduction.
Consider a reaction:
In Nernst form can be written as:
In the above equation
Concentration of solid is taken to be equal to unity i.e, [M (s) ]= 1
Then above equation can be written as :
This equation give the relationship between electrode reduction potential with temperature.
Cell potential in standard condition:
Cell potential in non-standard condition:
Want to see more full solutions like this?
Chapter 13 Solutions
CHEM FOR ENG >I<>CUSTOM<
- Given the following two standard reduction potentials, solve for the standard reduction potential of the half-reaction M3++eM2+ (Hint: You must use the extensive property G to determine the standard reduction potential.)arrow_forwardDetermine the overall reaction and its standard cell potential at 25 C for this reaction. Is the reaction spontaneous at standard conditions? Cu(s)|Cu2+(aq)Au3+(aq)|Au(s)arrow_forwardDetermine the overall reaction and its standard cell potential at 25 C for these reactions. Is the reaction spontaneous at standard conditions? Assume the standard reduction for Br2(l) is the same as for Br2(aq).. Pt(s)|H2(g)|H+(aq)Br2(aq),Br(aq)|Pt(s)arrow_forward
- Using values from the table of standard reduction potentials, calculate the cell potentials of the following cells. (a) Ga(s)|Ga3+(aq)Ag+(aq)|Ag(s) (b) Zn(s)|Zn2+(aq)Cr3+(aq)|Cr(s) (c) Fe(s),FeS(s)|S2-(aq)Sn2+(aq)|Sn(s)arrow_forwardGiven this reaction, its standard potential, and the standard half-cell potential of 0.34 V for the Cu2+ |Cu half-cell, calculate E° for the Fe(s)|Fe2+(aq) half-cell.arrow_forwardFor each reaction listed, determine its standard cell potential at 25 C and whether the reaction is spontaneous at standard conditions. (a) Mg(s)+Ni2+(aq)Mg2+(aq)+Ni(s) (b) 2Ag+(aq)+Cu(s)Cu2+(aq)+2Ag(s) (c) Mn(s)+Sn(NO3)2(aq)Mn(NO3)2(aq)+Sn(s) (d) 3Fe(NO3)2(aq)+Au(NO3)3(aq)3Fe(NO3)3(aq)+Au(s)arrow_forward
- An aqueous solution of an unknown salt of gold is electrolyzed by a current of 2.75 amps for 3.39 hours. The electroplating is carried out with an efficiency of 93.0%, resulting in a deposit of 21.221 g of gold. a How many faradays are required to deposit the gold? b What is the charge on the gold ions (based on your calculations)?arrow_forwardGalvanized steel pipes are used in the plumbing of many older homes. When copper plumbing is added to a system consisting of galvanized steel pipes it is necessary to place an insulator between the copper and the steel to avoid corrosion. Write a balanced oxidation-reduction equation for the reaction that occurs if the pipes are directly connected. What is the standard potential between the metals?arrow_forward
- Chemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningChemistry by OpenStax (2015-05-04)ChemistryISBN:9781938168390Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark BlaserPublisher:OpenStax
- Chemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage LearningChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage Learning