Some Important Compounds Of Calcium
Chapter Name : The S- Block Elements |
Sub Topic Code : 102_11_10_10_04 |
Topic Name : Some Important Compounds Of Calcium |
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Sub Topic Name : Calcium Sulphate (Plaster Of Paris) |
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Introduction
• It is a hemihydrate of calcium sulphate. • It is obtained when gypsum, CaSO4•2H2O, is heated to 393 K. • Above 393 K, no water of crystallization is left and anhydrous calcium sulphate, CaSO4 is formed. This is known as ‘dead burnt plaster’. • It has a remarkable property of setting with water. • The largest use of Plaster of Paris is in the building industry as well as plasters. • Used for immobilizing a bone fracture or sprain. • Used in dentistry, in ornamental work and for making casts of statues and busts.
Pre-Requisites:
elements, periodic table
Activity:
• The largest use of Plaster of Paris is in the building industry as well as plasters. • Used for immobilizing a bone fracture or sprain. • Used in dentistry, in ornamental work and for making casts of statues and busts.
Real Life Question:
What is plaster of Paris used for?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Plaster of Paris | Calcium sulphate. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Periodic table | Look at the elements present in the group 2 of the periodic table. |
Real life uses :
Used for building material, resetting fractured bones, dentistry.
Places to visit :
Construction site, hospital, museum.
Practical examples around us
| Examples | Explainations |
|---|---|
| Plastering a fracture | Plaster of Paris is used for resetting fractured bones. |
What you learn in Theory:
• It is a hemihydrate of calcium sulphate. • It is obtained when gypsum, CaSO4•2H2O, is heated to 393 K. • Above 393 K, no water of crystallization is left and anhydrous calcium sulphate, CaSO4 is formed. This is known as ‘dead burnt plaster’. • It has a remarkable property of setting with water. • The largest use of Plaster of Paris is in the building industry as well as plasters. • Used for immobilizing a bone fracture or sprain. • Used in dentistry, in ornamental work and for making casts of statues and busts.
What you learn in Practice:
Plaster of Paris is used in construction, resetting of fractured bones etc.