CAS 7778-18-9 Calcium sulfate - Materials / Alfa Chemistry

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Electrolytes

Calcium sulfate

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Catalog Number

ACM7778189

Product Name

Calcium sulfate

Structure

CAS

7778-18-9

Category

Electrolytes

Synonyms

Anhydrite

Description

Calcium sulfate appears as odorless, white powder or colorless, crystalline solid. Crystals sometimes have a blue, gray or reddish tinge or can be brick red. Density: 2.96 g cm-3.;DryPowder; DryPowder, OtherSolid; DryPowder, PelletsLargeCrystals; Liquid; OtherSolid; PelletsLargeCrystals; PelletsLargeCrystals, Liquid; WetSolid;Fine, white to slightly yellowish-white odourless powder;WHITE HYGROSCOPIC POWDER OR CRYSTALLINE POWDER.;Odorless, white powder or colorless, crystalline solid.;Odorless, white powder or colorless, crystalline solid. [Note: May have blue, gray, or reddish tinge.]

IUPAC Name

Calcium;sulfate

Molecular Weight

136.14

Molecular Formula

CaO4S

Canonical SMILES

[O-]S(=O)(=O)[O-].[Ca+2]

InChI

InChI=1S/Ca.H₂O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2

InChI Key

OSGAYBCDTDRGGQ-UHFFFAOYSA-L

Boiling Point

Decomposes (NIOSH, 2016);Decomposes;Decomposes

Melting Point

1450 °C

Purity

99%+

Density

2.9 g/cm³

Solubility

Soluble in water

Appearance

White powder

Storage

Room Temperature

Color/Form

NATURAL ANHYDRITE CRYSTALS ARE COLORLESS, RHOMBIC OR MONOCLINIC;NATURAL ANHYDRITE CRYSTALS ARE ORTHORHOMBIC, COLOR VARIES (WHITE WITH BLUE, GRAY OR REDDISH TINGE, OR BRICK RED);INSOL ANHYDRITE HAS SAME CRYSTAL STRUCTURE AS MINERAL ANHYDRITE;SOL ANHYDRITE IS OBTAINED IN GRANULAR OR POWDER FORM;SOL ANHYDRITE CRYSTALS ARE COLORLESS, HEXAGONAL OR TRICLINIC;PURE ANHYDROUS CALCIUM SULFATE EXISTS IN FORM OF WHITE POWDER OR CRYSTALS;White powder or colorless, crystalline solid [Note: May have blue, gray, or reddish tinge].

Complexity

62.2

Covalently-Bonded Unit Count

EC Number

231-900-3;231-900-3

Exact Mass

135.9143205

Formal Charge

Heavy Atom Count

ICSC Number

1589

MDL Number

MFCD00010912

MeSH Entry Terms

Alabaster;Anhydrous Sulfate of Lime;Artificial Dental Stone;Calcium Sulfate;Calcium Sulfate (1:1), Dihydrate;Calcium Sulfate (1:1), Hemihydrate;Calcium Sulfate (2:1);Calcium Sulfate Dihydrate;Calcium Sulfate, Anhydrous;Calcium Sulfate, Dihydrate;Calcium Sulfate, Hemihydrate;Calcium Sulphate;Dental Gypsum;Dental Stone, Artificial;Drierite;Gypsite;Gypsum;Gypsum, Dental;Karstenite;Plaster of Paris;Stone, Artificial Dental

Monoisotopic Mass

135.9143205

Odor

Odorless

Other Experimental

POSSESSES HIGH AFFINITY FOR WATER & WILL ABSORB 6.6% OF ITS WT OF WATER FORMING STABLE HEMIHYDRATE /SOL ANHYDRITE/;LOSES 1/2 H₂O AT 163 °C /HALF-HYDRATE/;TASTELESS; SETS TO HARD MASS WHEN MIXED WITH WATER /HEMIHYDRATE/;NEITHER ANHYDROUS NOR DIHYDRATE FORMS CAN SET WITH WATER;WHITE POWDER /HALF-HYDRATE/;COLORLESS MONOCLINIC CRYSTALS /DIHYDRATE/;LUMPS OR POWDER /DIHYDRATE/;0.3 G/100 CC H₂O AT 20 °C; SOL IN ACIDS, AMMONIUM SALTS & GLYCERIN; SLIGHTLY SOL IN HOT WATER /HALF-HYDRATE/;VERY SOL IN GLYCEROL; PRACTICALLY INSOL IN MOST ORG SOLVENTS /DIHYDRATE/;SOL IN SODIUM THIOSULFATE; INDEX OF REFRACTION: 1.505, 1.548; DENSITY 2.61; MP ABOVE 200 °C WITH TRANSITION TO RHOMBIC CRYSTALS /SOL ANHYDRITE/;INDEX OF REFRACTION: 1.521, 1.523, 1.530; LOSES 1/2 H₂O AT 128 °C & 2 H₂O AT 163 °C /DIHYDRATE/;Solubility in water at 20 °C, g/100 g solution: 0.21 /Dihydrate/;Solubility in water at 20 °C, g/100 g solution: 0.67 /Hemihydrate, alpha-form/;Solubility in water at 20 °C, g/100 g solution: 0.88 /Hemihydrate, beta-form/;Solubility in water at 20 °C, g/100 g solution: 0.27 /Anhydrite/

Packaging

1 kg

Refractive Index

INDEX OF REFRACTION: 1.569, 1.575, 1.613

Rotatable Bond Count

Stability

Stable. Incompatible with aluminium, strong acids.

Storage Conditions

Store at RT.

Topological Polar Surface Area

88.6 Å²

UNII