Nernst Equation
Chapter Name : Electrochemistry |
Sub Topic Code : 102_12_03_04_03 |
Topic Name : Nernst Equation |
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Sub Topic Name : Electrochemical Cell And Giggs Energy Of The Reaction |
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Introduction
·
Gibbs energy is the chemical energy associated with a chemical reaction taking place in a
galvanic cell.
·
The reversible work done by
a galvanic cell is equal to decrease in its Gibbs energy.
·
The
expression for calculation Gibbs energy is :
?Gr = - n F E (cell)
Pre-Requisites:
·
Redox reactions
·
Galvanic cells
Measurement of
electrode potential
Activity:
Electrical batteries
Real Life Question:
How do we calculate
the maximum work done by an electrochemical cell ?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Electrochemical or galvanic cell | A device in which chemical energy released during a chemical reaction is converted into electrical energy. |
| Gibbs free energy | The energy associated with a chemical reaction that can be used to do work. |
| Electrode potential | The potential difference between the metal rod and its ion in solution due to difference in charge. |
| Cell potential | The potential difference between the two electrodes of a galvanic cell. |
| Standard electrode potential | If the electrode is suspended in a solution of 1 molar concentration at 298 K, the electrode potential is called as standard electrode potential. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Batteries | Batteries have circuits |
Real life uses :
Only a spontaneous
electrochemical reaction (change in Gibbs free energy less than zero) can be
used to generate an electric current in electrochemical cells.
Places to visit :
Home
Practical examples around us
| Examples | Explainations |
|---|---|
| Home | Electrical batteries used in torches, watches are made of electrochemical cells. |
What you learn in Theory:
Measurement of work
done by an electrochemical cell.
What you learn in Practice:
Batteries have
potential