Calcium Sulphate Anhydrous Scientific Reagent
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Product Code : SCL-CA-12656
Quick Answer: The Calcium Sulphate Anhydrous Scientific Reagent is water-free calcium sulphate (CaSO4) for supervised work on sulphate salts, formula-mass calculations, drying-support demonstrations and hydrate comparisons.
Last updated: October 2026
Key Features
- Formula CaSO4, CAS 7778-18-9
- Molecular weight about 136.14 g/mol
- White solid for weighing and controlled demonstrations
- Distinct from gypsum (dihydrate) and plaster of Paris (hemihydrate)
- Kept tightly closed to limit moisture exposure
Technical Specifications
| Specification | Value |
|---|---|
| Chemical name | Calcium sulphate, anhydrous |
| Formula | CaSO4 / CaO4S |
| CAS number | 7778-18-9 |
| Molecular weight | About 136.14 g/mol |
| Synonyms | Anhydrous calcium sulfate, anhydrous gypsum |
About This Product
Comparing the anhydrous salt with its hemihydrate and dihydrate forms helps students see how water of crystallisation changes formula weight and behaviour. The reagent is also used in drying-support demonstrations where CaSO4 is specified. It is handled with a clean, dry spatula, goggles and gloves, and the container is closed straight after use.
Frequently Asked Questions
Q1. How is anhydrous calcium sulphate different from gypsum?
Gypsum is the dihydrate and plaster of Paris is the hemihydrate. The anhydrous form contains no water of crystallisation, which changes its formula weight and drying behaviour.
Related: Chemical Analysis, Laboratory Quality Barium Hydroxide, Benzoic Acid Testing Reagent.
For a quotation on the Calcium Sulphate Anhydrous Scientific Reagent, contact School Equipments India.
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