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Calcium carbonate CAS#471-34-1

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Chemical Name：Calcium carbonate

CAS No.:471-34-1

Molecular weight:100.0869

Sample: Available

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Product Details

Products Description of Calcium carbonate CAS#471-34-1
Calcium carbonate occurs in nature as limestone in various forms, such as marble, chalk, and coral. It is probably the most widely-used raw material in the chemical industry. It has numerous applications, primarily to produce cement, mortars, plasters, refractories, and glass as building materials. It also is used to produce quicklime, hydrated lime and a number of calcium compounds. It is produced either as powdered or precipitated calcium carbonate. The latter consists of finer particles of greater purity and more uniform size. They also have many important commercial applications. Various grades of precipitated calcium carbonate are used in several products, such as textiles, papers, paints, plastics, adhesives, sealants, and cosmetics.

Calcium carbonate occurs in two forms—hexagonal crystal known as calcite, and orthorhombic form, aragonite. Calcite decomposes on heating at 825°C, aragonite melts at 1,339°C (at 102.5 atm). Density 2.71 g/cm3 (calcite), 2.83 g/cm3 (aragonite); insoluble in water (15mg/L at 25°C); Ksp 4.8x10–9 ; soluble in dilute mineral acids.

Calcium carbonate is a naturally occurring compound found in organisms and throughout the earth’s crust. After quartz, calcium carbonate, primarily in the form of calcite, is the most common mineral found in the crust. Geologically, calcium carbonate exists in several mineral forms: calcite, aragonite, and vaterite. Calcite is the most common calcium carbonate mineral, whereas vaterite is a very rare form. The different mineral forms of calcium carbonate are based on their crystalline structure. The form of calcium carbonate depends on the conditions at its formation such as temperature and pressure.

Calcium carbonate Chemical Properties

Melting point	825 °C
Boiling point	800 °C
density	2.93 g/mL at 25 °C (lit.)
refractive index	1.6583
storage temp.	Store at +5°C to +30°C.
solubility	5 M HCl: 0.1 M at 20 °C, clear, colorless
form	random crystals
color	White-beige to slightly beige-gray
Specific Gravity	2.93
PH	9.91(1 mM solution);9.91(10 mM solution);9.91(100 mM solution);
Odor	Odorless
PH Range	8
Water Solubility	Insoluble
λmax	λ: 260 nm Amax: ≤0.09 λ: 280 nm Amax: ≤0.06
Merck	14,1657
BRN	8008338
Solubility Product Constant (Ksp)	pKsp: 8.54
Exposure limits	NIOSH: TWA 10 mg/m3; TWA 5 mg/m3
Dielectric constant	6.1（Ambient）
Stability:	Stable. Incompatible with acids, fluorine, ammonium salts, alum.
InChIKey	VTYYLEPIZMXCLO-UHFFFAOYSA-L
CAS DataBase Reference	471-34-1(CAS DataBase Reference)
EPA Substance Registry System	Calcium carbonate (471-34-1)

Safety Information

Hazard Codes	Xi
Risk Statements	37/38-41-36/38-36
Safety Statements	26-36/37/39-37/39-37
OEB	B
OEL	TWA: 10 mg/m3 (total)
WGK Germany	-
RTECS	FF9335000
TSCA	Yes
HS Code	28365000
Hazardous Substances Data	471-34-1(Hazardous Substances Data)
Toxicity	LD50 orally in Rabbit: 6450 mg/kg LD50 dermal Rat > 2000 mg/kg