Calcium sulfate dihydrate

Synonym(s):Calcium sulfate dihydrate

CAS NO.：10101-41-4
Empirical Formula: CaH6O5S
Molecular Weight: 158.18
MDL number: MFCD00149625
EINECS: 231-900-3
SAFETY DATA SHEET (SDS)
Update Date: 2024-10-30 18:52:02

What is Calcium sulfate dihydrate ?

Chemical properties

monoclinic; hardness 1.5–2.0 Mohs; lumps or white powder(s); used in manufacturing portland cement, plaster of paris and artificial marble [KIR78] [MER06] [STR93]

The Uses of Calcium sulfate dihydrate

Calcium Sulfate Dihydrate is obtained from gypsum, a naturally occurring compound. Also used in the preparation of calcium sulfate and calcium sulfoaluminate.

The Uses of Calcium sulfate dihydrate

Used in this determination of oxalates

Definition

A mineral that consists of calcium sulfate with water molecules attached, or the rock that consists primarily of this mineral.

Definition

Gypsum: a monoclinic mineralform of hydrated calcium sulphate,CaSO₄.2H₂O. It occurs in five varieties:rock gypsum, which is oftenred stained and granular; gypsite, animpure earthy form occurring as asurface deposit; alabaster, a purefine-grained translucent form; satinspar, which is fibrous and silky; andselenite, which occurs as transparentcrystals in muds and clays. It is usedin the building industry and in themanufacture of cement, rubber,paper, and plaster of Paris.

Hazard

Nasal symptoms.

Agricultural Uses

Selenite, which is a salt of selenic acid (H₂SeO₃), and very similar to sulphite, is made by the oxidation of selenium by nitric acid. The low solubility of ironselenite complexes is responsible for the non-toxic level of selenium in plants growing on acid soils having a very high total selenium content. Plants absorb selenite, but generally to a lesser extent, than selenate, which is another form of selenium.

Safety Profile

Human systemic effects by inhalation: fibrosing alveolitis ('growth of fibrous tissue in the lung), unspecified respiratory system effects, and unspecified effects on the nose. Questionable carcinogen with experimental carcinogenic data. Long considered a nuisance dust (dependmg on silica content). When heated to decomposition it emits toxic fumes of SO,. See also CALCIUM SULFATE, CALCIUM COMPOUNDS, and SULFATES.

Synthesis

Calcium sulfate dehydrate (CSD) was firstly synthesized via the reaction of H2SO4 and Ca(OH)2 using ethanol as morphology modifier.

Purification Methods

It loses only part of its H2O at 100-150o (see below). It is soluble in H2O and very slowly soluble in glycerol. It is insoluble in most organic solvents.

Properties of Calcium sulfate dihydrate

Melting point:	128°C -1.5H₂O
Boiling point:	163°C -2H₂O
Density	2.32
Flash point:	163°C -2H₂O
storage temp.	Store at +5°C to +30°C.
solubility	H₂O: 0.01 M at 20 °C, clear, colorless
form	powder
color	White
Specific Gravity	2.32
PH	7.0 (50g/l, H2O, 20℃)(slurry)
Odor	at 100.00?%. odorless
Water Solubility	2 g/L (20 ºC)
Sensitive	Hygroscopic
Merck	14,1706
Solubility Product Constant (Ksp)	pKsp: 4.5
Dielectric constant	2.5（Ambient）
Exposure limits	ACGIH: TWA 10 mg/m3
Stability:	Stable. Incompatible with aluminium, strong acids.
CAS DataBase Reference	10101-41-4(CAS DataBase Reference)
NIST Chemistry Reference	calcium sulfate(10101-41-4)
EPA Substance Registry System	Calcium sulfate dihydrate (10101-41-4)

Safety information for Calcium sulfate dihydrate

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P280:Wear protective gloves/protective clothing/eye protection/face protection. P321:Specific treatment (see … on this label). P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.