Nernst Equation
Chapter Name : Electrochemistry |
Sub Topic Code : 102_12_03_04_01 |
Topic Name : Nernst Equation |
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Sub Topic Name : Nernst Equation |
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Introduction
Nernst equation is used to calculate the
potential of cell when the concentration of ions is not unity.
The
Nernst equation is given by :
nF [A]a [B]b
Pre-Requisites:
· Redox reactions
· Galvanic cells
Measurement of electrode potential
Activity:
Electrical batteries
Real Life Question:
How is electrode
potential of a cell measured?
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. |
| Electrodes | Metallic rods dipped in the electrolyte solution. |
| Anode | It is a positively charged electrode, where electrons are released or oxidation occurs. |
| Cathode | It is a negatively charged electrode, where electrons are accepted or reduction occurs. |
| Half cells | The two containers involving oxidation and reduction half reactions are called Half cells. |
| 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 |
|---|---|
| Galvanic cell | Nernst equation calculates the potential of a cell |
Real life uses :
Nernst equation is
used for pH, solubility measurements.
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 the
electrode potential of a cell.
What you learn in Practice:
Nernst equation helps
to measure the potential of a cell