Adsorption
Chapter Name : Surface Chemistry |
Sub Topic Code : 102_12_05_02_07 |
Topic Name : Adsorption |
|
Sub Topic Name : Applications Of Adsorption |
|
Introduction
·
Adsorption
is used in both research and industry
·
To produce a high vacuum by using charcoal
·
Gas masks contain charcoal which adsorbs
poisonous gases
·
Control of humidity
· Chromatographic analysis
Pre-Requisites:
Introduction of adsorption.
Adsorption mechanism.
Adsorption
isotherms.
Activity:
When charcoal is added to acetic acid, its
concentration decreases. This concentration is then measured. The difference
b/w the initial and final concentration gives us the extent of adsorption in
solution.
Real Life Question:
Why is silica gel packets placed in new bags and
containers?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Adsorption | It is the phenomenon of accumulation of molecules of a liquid/gas on the surface of a solid. |
| Adsorbate | It is the substance which concentrates or accumulates on the surface of another substance. |
| Adsorbent | It is the substance on which adsorption occurs i.e. on which another substance gets accumulated. |
| Adsorption isotherm | It is the graph between the amounts of adsorbate (x) adsorbed on the surface of adsorbent (m) and concentration at constant temperature. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Acetic acid solution of different concentrations | Take equal quantities of different concentration of acetic acid solution in different flasks. |
| Activated charcoal | To each flask add equal amount of charcoal. |
Real life uses :
Refining of edible oil, sugar.
Places to visit :
Laboratory.
Practical examples around us
| Examples | Explainations |
|---|---|
| Silica gel packets | Used to absorb moisture. |
What you learn in Theory:
Adsorption of solute particles from the solution on
the solid surface.
What you learn in Practice:
How adsorption from solution phase is used for
cleansing of compounds.