Question
Download Solution PDFWhich of the following is known as ‘Plaster of Paris’?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCorrect Answer CaSO4⋅1/2H2O
Key Points Explanation:
- Plaster of Paris (POP) is a quick-setting gypsum plaster consisting of a fine white powder (calcium sulfate hemihydrate), which hardens when moistened and allowed to dry.
- It is also known as the Plaster of Paris because for the preparation of POP, the abundant gypsum was first found near the capital city of France i.e. Paris.
- The chemical formula of the Plaster of Paris is CaSO4.
H2O = - Application of Plaster of Paris is as follows
- It is used as a building material as a protective coating on walls and ceilings.
- It is used as a moulding and vesting agent for decorative elements.
- It is also used for aesthetic touch to the construction elements.
- It is also used as plaster in orthopaedics and as a filling material by dentists, etc.
Confusion Points:
- Gypsum is an ore of Calcium (Ca). The chemical formula of Gypsum is CaSO4. 2H2O.
- Gypsum is mainly used as a fertilizer, as the main constituent in plaster, chalk, etc.
- The plaster of Paris on mixing with water produces gypsum.
- Calcium Sulphate Hemihydrate (CaSO4·1/2 H2O) on hydration leads to the crystallization of gypsum calcium sulphate dihydrate (CaSO4·2H2O).
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