Colligative Properties And Determination Of Molar Mass
Chapter Name : Solutions |
Sub Topic Code : 102_12_02_06_04 |
Topic Name : Colligative Properties And Determination Of Molar Mass |
|
Sub Topic Name : Osmosis And Osmotic Pressure |
|
Introduction
Raisins swell when kept in water.
Pre-Requisites:
Raisins , water , beaker
Activity:
The direction of flow of water is from lower to higher concentration of the two solutions.
Real Life Question:
Why do mangoes shrivel when kept in saline water ?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| osmosis Osmotic pressure Semi-permeable membrane | Solvent molecules flow from higher concentration to low concentration. The excess pressure applied to prevent the process of osmosis. A membrane that allows only small molecules to pass through like solvent molecules. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Wilted flower in a beaker of water | Water flows inside and the flower revives to become fresh. |
Real life uses :
Preservation of food items in saturated sugar or salt solutions.
Places to visit :
Garden / bio lab / home .
Practical examples around us
| Examples | Explainations |
|---|---|
| Preserving food in saline conditions | The bacteria growing on food are made to shrink by the process of osmosis |
What you learn in Theory:
Solvent molecules can cross the semi-permeable membrane and cause swelling or shrinking
What you learn in Practice:
Substance can absorb or loose water in presence of a semi-permeable membrane.