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Calcium Sulfate
Calcium Sulfate (Product Code: SCI-714/315) is an analytical reagent grade calcium salt, the compound behind gypsum and plaster of Paris, used to study permanent water hardness, sparingly soluble salts and the setting of plaster in school and college laboratories. It comes as a 100 g pack with an MSDS, a practical quantity for demonstrations and group work. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India, to institutions buying school chemistry lab equipment in India.
Specifications
| Parameter | Detail |
|---|---|
| Chemical | Calcium sulfate |
| Grade | Analytical reagent |
| Pack size | 100 g |
| Form (anhydrous or hydrate) | Not stated in the listing; please confirm when enquiring |
| Safety data | MSDS supplied |
| Shelf life | Shelf life depends on the chemical, its grade and storage conditions; ask us for the expiry date of the batch you are quoted. |
| Product code | SCI-714/315 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is Calcium Sulfate Used For?
Dissolving a little Calcium Sulfate in distilled water gives a model of permanently hard water: boiling does not soften it, but adding washing soda precipitates calcium carbonate and removes the hardness. Shaking samples with soap solution before and after treatment lets students compare the lather and see the difference for themselves.
The salt also links chemistry to everyday materials. Gypsum is the dihydrate, gentle heating turns it into the hemihydrate known as plaster of Paris, and that plaster sets hard again when mixed with water. Because Calcium Sulfate dissolves only slightly, it is also a clear example in solubility and precipitation lessons, and the anhydrous form is used as a drying agent.
What to Specify When Ordering
- The form you need: anhydrous, dihydrate (gypsum) or hemihydrate, since the listing does not state it.
- The number of 100 g packs required.
- Any companion reagents for hardness practicals, such as washing soda, to be quoted together.
- The delivery destination, within India or overseas.
Supplier
Jain Scientific Equipments Private Limited, known to customers as ScienceLab, supplies Calcium Sulfate from Ambala, Haryana, within a reagent range covering the salts used in water-quality and materials lessons. Enquiries from schools, colleges, dealers and importers are answered directly by the company's Ambala team. See the ScienceLab company profile for background.
Related Laboratory Equipment
Water-hardness and plaster lessons that use Calcium Sulfate often add these items:
- Plaster of Paris (POP) — the hemihydrate, for setting and casting demonstrations.
- Sodium Carbonate — washing soda that removes permanent hardness by precipitation.
- Calcium Chloride 200g — another hardness-causing calcium salt, far more soluble, for comparison.
- Barium Chloride — confirms sulfate ions with a white precipitate.
- Vacuum Desiccator — the vessel where anhydrous drying agents keep samples dry.
Browse the Laboratory Equipment category for further salts and apparatus.
Frequently Asked Questions
What is Calcium Sulfate used for in the laboratory?
Calcium Sulfate is used to model permanent water hardness, to show how gypsum and plaster of Paris are related, and as an example of a sparingly soluble salt in precipitation lessons. Its anhydrous form also serves as a drying agent in general laboratory work.
Is Calcium Sulfate the same as gypsum or plaster of Paris?
Calcium Sulfate is the chemical behind both: gypsum is the dihydrate, and plaster of Paris is the hemihydrate made by heating gypsum. This listing does not state which form the analytical reagent pack contains, so confirm the form you need when you enquire.
Why is Calcium Sulfate used to model permanent hardness?
Calcium Sulfate causes permanent hardness because boiling does not remove it, unlike calcium hydrogencarbonate. A dilute solution lets students test lather with soap, then soften the water with washing soda, which precipitates the calcium as calcium carbonate.
Does Calcium Sulfate dissolve in water?
Calcium Sulfate dissolves only slightly in water, so a stirred suspension leaves undissolved solid behind and gives a saturated solution. That low solubility makes it a useful contrast with very soluble calcium salts such as calcium chloride in solubility lessons.
What is the shelf life of Calcium Sulfate?
Shelf life depends on the chemical, its grade and storage conditions, so no fixed period is quoted for Calcium Sulfate. Ask us for the expiry date of the batch you are quoted, and keep the pack sealed, because the anhydrous form picks up moisture from air.
How can an institution order Calcium Sulfate?
Institutions and dealers can order Calcium Sulfate by sending the number of 100 g packs, the form required and the delivery address. Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, then sends a quotation for supply within India or to international markets.
Request a Quote
For a Calcium Sulfate quotation, tell us the form, pack count and destination through our contact page, or add the item to the enquiry cart with your other water-testing reagents. We will reply with pricing, availability and the batch expiry date.
Last updated: 24 September 2026
