Chemistry, asked by rugvedphad08, 11 months ago

What is calcium sulphate?​

Answers

Answered by mrsluckysingh7347
0

Answer:

Calcium sulfate, CaSO4, is a naturally occurring calcium salt. It is commonly known in its dihydrate form, CaSO4∙2H2O, a white or colourless powder called gypsum. As uncalcined gypsum, the sulfate is employed as a soil conditioner.

Answered by virengonarkar
1

Explanation:

Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO4 and related hydrates. In the form of γ-anhydrite (the anhydrous form), it is used as a desiccant. One particular hydrate is better known as plaster of Paris, and another occurs naturally as the mineral gypsum. It has many uses in industry. All forms are white solids that are poorly soluble in water.[6] Calcium sulfate causes permanent hardness in water.

Calcium sulfate

Calcium sulfate anhydrous

Calcium sulfate hemihydrate

Names

Other names

Plaster of Paris

Drierite

Gypsum

Identifiers

CAS Number

7778-18-9 ☑

10034-76-1 (hemihydrate) ☒

10101-41-4 (dihydrate) ☒

3D model (JSmol)

Interactive image

ChEBI

CHEBI:31346 ☑

ChemSpider

22905 ☑

ECHA InfoCard

100.029.000

E number

E516 (acidity regulators, ...)

KEGG

D09201 ☒

PubChem CID

24928

RTECS number

WS6920000

UNII

E934B3V59H ☑

CompTox Dashboard (EPA)

DTXSID9029699 Edit this at Wikidata

InChI

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

Key: OSGAYBCDTDRGGQ-UHFFFAOYSA-L ☑

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

Key: OSGAYBCDTDRGGQ-NUQVWONBAU

SMILES

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

Properties

Chemical formula

CaSO4

Molar mass

136.14 g/mol (anhydrous)

145.15 g/mol (hemihydrate)

172.172 g/mol (dihydrate)

Appearance

white solid

Odor

odorless

Density

2.96 g/cm3 (anhydrous)

2.32 g/cm3 (dihydrate)

Melting point

1,460 °C (2,660 °F; 1,730 K) (anhydrous)

Solubility in water

0.21g/100ml at 20 °C (anhydrous)[1]

0.24 g/100ml at 20 °C (dihydrate)[2]

Solubility product (Ksp)

4.93 × 10−5 mol2L−2 (anhydrous)

3.14 × 10−5 (dihydrate)

[3]

Solubility in glycerol

slightly soluble (dihydrate)

Acidity (pKa)

10.4 (anhydrous)

7.3 (dihydrate)

Magnetic susceptibility (χ)

-49.7·10−6 cm3/mol

Structure

Crystal structure

orthorhombic

Thermochemistry

Std molar

entropy (So298)

107 J·mol−1·K−1 [4]

Std enthalpy of

formation (ΔfH⦵298)

-1433 kJ/mol[4]

Hazards

Safety data sheet

See: data page

ICSC 1589

NFPA 704 (fire diamond)

NFPA 704 four-colored diamond

010

Flash point

Non-flammable

NIOSH (US health exposure limits):

PEL (Permissible)

TWA 15 mg/m3 (total) TWA 5 mg/m3 (resp) [for anhydrous form only][5]

REL (Recommended)

TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) [anhydrous only][5]

IDLH (Immediate danger)

N.D.[5]

Related compounds

Other cations

Magnesium sulfate

Strontium sulfate

Barium sulfate

Related desiccants

Calcium chloride

Magnesium sulfate

Related compounds

Plaster of Paris

Gypsum

Supplementary data page

Structure and

properties

Refractive index (n),

Dielectric constant (εr), etc.

Thermodynamic

data

Phase behaviour

solid–liquid–gas

Spectral data

UV, IR, NMR, MS

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

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