This document discusses the electromotive force (EMF) of galvanic cells. It defines EMF as the potential difference between electrodes that causes electron flow. The EMF of a cell is calculated as the cathode reduction potential minus the anode reduction potential. As an example, the EMF of a cell constructed from a copper anode and silver cathode is +0.46 V. The document also provides four numerical problems calculating EMF values for different metal combinations using their standard reduction potentials.
It is about molecular orbital theory specially mo diagram of diatomic atoms,their bond orders,bond lengths and stability and experimental evidences of ionisation energy from PES.
It is about molecular orbital theory specially mo diagram of diatomic atoms,their bond orders,bond lengths and stability and experimental evidences of ionisation energy from PES.
lecture slide on:
Gibbs free energy and Nernst Equation, Faradaic Processes and Factors Affecting Rates of Electrode Reactions, Potentials and Thermodynamics of Cells, Kinetics of Electrode Reactions, Kinetic controlled reactions,Essentials of Electrode Reactions,BUTLER-VOLMER MODEL FOR THE ONE-STEP, ONE-ELECTRON PROCESS,Current-overpotential curves for the system, Mass Transfer by Migration And Diffusion,MASS-TRANSFER-CONTROLLED REACTIONS,
This slide give you idea about the atomic structure, classification of solids based on valance electron, free electron, energy band description, why the silicon is used as semiconductor substance compare to germanium, semiconductor and its types.
lecture slide on:
Gibbs free energy and Nernst Equation, Faradaic Processes and Factors Affecting Rates of Electrode Reactions, Potentials and Thermodynamics of Cells, Kinetics of Electrode Reactions, Kinetic controlled reactions,Essentials of Electrode Reactions,BUTLER-VOLMER MODEL FOR THE ONE-STEP, ONE-ELECTRON PROCESS,Current-overpotential curves for the system, Mass Transfer by Migration And Diffusion,MASS-TRANSFER-CONTROLLED REACTIONS,
This slide give you idea about the atomic structure, classification of solids based on valance electron, free electron, energy band description, why the silicon is used as semiconductor substance compare to germanium, semiconductor and its types.
This presentation gives you idea about following topics
1.atomic structure
2.classification of solids based valance electron, free electron, energy band description
3.semiconductor and its type
Electrochemistry is the study of electron movement in an oxidation or reduction reaction at a polarized electrode surface. Each analyte is oxidized or reduced at a specific potential and the current measured is proportional to concentration. This technique is a powerful methodology towards bioanalysis.
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Electrochemistry - an overv
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11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
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For more details visit on YouTube; @SELF-EXPLANATORY;
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Thanks...!
1. Dr. K. RAJENDER REDDY
LECTURER IN CHEMISTRY
EMAIL:raj3iict@gmail.com
24 April 2020 ELECTRODEPOTENTIAL-KRR 1
2. CONTENTS
Electro Motive Force(EMF)
1. Definition
2. Calculation of EMF of the cell
3. EMF of the cell constructed from Cu and Ag
4. Numerical problems
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3. EMF OF THE CELL
Definition: The potential difference between two
electrodes of a galvanic cell, which causes flow
electrons is called electromotive force(EMF)
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4. Calculation of EMF of Cell(Ecell)
• The emf of the cell can be calculated from the
elctrode potential values
• Ecell= Ecathode-Eanode
Or
Ecell = RP of cathode-RP of anode
or
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5. EMF of the cell constructed from Cu and Ag
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The reading (+0.46 v)of the
voltmeter in picture is the
EMF of the cell constructed
from Cu (anode) and
Ag(cathode)
6. Calculation of EMF
• Ecell= ERHS-ELHS
Where RHS = Right Hand Side
LHS = Left Hand Side
Ecell = RP of cathode + OP of anode
If EMF of the cell is calculated from standard
electrode potentials, then it is indicated as Eo
cell
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ECELL= ERHS+ELHS
7. NUMERICAL PROBLEMS ON EMF OF THE CELL
• PROBLEM 1:
The SRP of Mg and Cd electrodes are -2.37 V and -0.40 V respectively.
Calculate the EMF of the cell Mg/Mg+2//Cd+2/Cd.
Solution:
In this cell Mg is anode and Cd is Cathode.
Eo
cell = Eo
cathode- Eo
anode
=-0.40 V–(-2.37 V)
= + 1.97V
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8. NUMERICAL PROBLEMS ON EMF OF THE CELL
24 April 2020 ELECTRODEPOTENTIAL-KRR 8
• PROBLEM 2:
The Zn/Zn+2 electrode potential is +0.76 V and Cu+2/Cu electrode potential is
+0.34V respectively. Calculate the EMF of the cell Zn/Zn+2//Cu+2/Cu.
Solution:
In this cell Zn is anode and Cu is Cathode.
Eo
cell = Eo
cathode- Eo
anode
= +0.34V –(- 0.76 V)
= + 1.1 V
9. NUMERICAL PROBLEMS ON EMF OF THE CELL
24 April 2020 ELECTRODEPOTENTIAL-KRR 9
• PROBLEM 3:
The Zn/Zn+2 electrode potential is +0.76 V and Ca+2/Ca electrode potential is -
2.87 V . Calculate the EMF of the cell Ca/Ca+2//Zn+2/Zn.
Solution:
In this cell Ca is anode and Zn is Cathode.
Eo
cell = Eo
cathode- Eo
anode
= -0.76 V –(- 2.87 V)
= + 2.10 V
10. NUMERICAL PROBLEMS ON EMF OF THE CELL
24 April 2020 ELECTRODEPOTENTIAL-KRR 10
• PROBLEM 4:
The SRP of Ni and Cd electrode are -0.25 V and +0.34 V respectively.
What is the EMF of the cell constructed from these electrodes.
Solution:
In this cell Ni is anode and Cd is Cathode.
Eo
cell = Eo
cathode- Eo
anode
= +0.34V –(- 0.25 V)
= + 0.59 V