| Chemical Properties | Back Directory | [Melting point ]
>300°C | [storage temp. ]
Hygroscopic, Room Temperature, under inert atmosphere | [solubility ]
Water (Slightly) | [form ]
Solid | [color ]
Off-White to Pale Grey | [Water Solubility ]
2.4g/L | [Specific Heat Capacity]
Cp(crystal):0.732334J/(g·K),at 25℃ | [Solubility Product Constant (Ksp)]
pKsp: 4.31 | [Dielectric constant]
5.6（0.0℃） | [Uses]
Calcium Sulfate is a general additive available as both calcium sul-
fate anhydrous, made by the high-temperature calcining of gypsum
which is then ground and separated, and calcium sulfate dihydrate,
which is made by grinding and separating gypsum containing about
20% water of crystallization. calcium sulfate anhydrous contains
approximately 29% calcium, and calcium sulfate dihydrate contains
approximately 23% calcium. it is used, among other things, as a
filler and baking powder for standardization purposes; a firming
agent in canned potatoes, tomatoes, carrots, lima beans, and pep-
pers; in dough as a source of calcium ions (because the absence of
calcium ions causes bread dough to be soft and sticky and to pro-
duce bread of poor quality); in soft-serve ice cream to produce dry-
ness and stiffness; as a calcium ion source for reaction with alginates
to form dessert gels; and as a calcium source for food enrichment. |
| Questions And Answer | Back Directory | [Description]
Calcium sulfate,CaS04, is a grayish-white dense powder that occurs in nature in both an anhydrous form (anhydrite) and hydrated form(gypsum); it is also the byproduct of many chemical reactions. It has many industrial uses;for example, as a source of sulfur and sulfuric acid,in cements, tiles and plaster,as a soil conditioner, in paints, dyes,and polishes, and as a food additive.
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| Hazard Information | Back Directory | [Application]
Calcium sulfate serves as a material in carbonation studies to produce vaterite, which is explored for cement applications[1]. Calcium sulfate minerals (gypsum, bassanite, anhydrite) act as solid sources in carbonation reactions with sodium carbonate[1]. | [Definition]
ChEBI: Calcium sulfate is a calcium salt and an inorganic calcium salt. | [Preparation]
Calcium Sulfate may be
prepared by the addition of a soluble calcium salt to
a solution of sodium sulfate:
CaCl2＋ Na2SO4→CaSO4＋ 2NaCl
The product is generally a dihydrate although other
hydrates are also known. The CAS numbers of these
materials are: 7778-18-9 (anhydrite); 10034-76-1 (hemihydrate); 10101-41-4 (dihydrate). | [Industrial uses]
Calcium sulfate (CaSO4?2H2O) is the common blackboard chalk. | [References]
[1] Pimentel, C., Montes‐Hernández, G., Almarza‐Cifuentes, P., Kellermeier, M., & Van Driessche, A. E. (2026). From waste to value: Conversion of calcium sulfate to vaterite via carbon capture and storage. Advanced Functional Materials, 36(34). https://doi.org/10.1002/adfm.202519977
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