Calcium carbonate

Calcium carbonate is a chemical compoond wi the formula CaCO₃. It is a common substance foond in rocks in aw pairts o the warld, an is the main component o shells o marine organisms, snails, coal balls, pairls, an eggshells. Calcium carbonate is the active ingredient in agricultural lime, an is creatit when Ca ions in haird watter react wi carbonate ions creatin limescale. It is commonly uised medicinally as a calcium supplement or as an antacid, but excessive consumption can be hazardous.

Calcium carbonate

Names
IUPAC name Calcium carbonate
Ither names Limestone; calcite; aragonite; chalk; marble; pairl; oyster
Identifiers
CAS Nummer	471-34-1 Y
3D model (JSmol)	Interactive eemage Interactive eemage
ChEBI	CHEBI:3311 Y
ChEMBL	ChEMBL1200539 N
ChemSpider	9708 Y
EC Nummer	207-439-9
KEGG	D00932 Y
PubChem CID	10112
RTECS nummer	FF9335000
UNII	H0G9379FGK Y
InChI InChI=1S/CH2O3.Ca/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Y Key: VTYYLEPIZMXCLO-UHFFFAOYSA-L Y InChI=1/CH2O3.Ca/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: VTYYLEPIZMXCLO-NUQVWONBAS
SMILES [Ca+2].[O-]C([O-])=O C(=O)([O-])[O-].[Ca+2]
Properties
Chemical formula	CaCO3
Molar mass	100.0869 g/mol
Appearance	Fine white pouder; chalky taste
Odour	odorless
Density	2.711 g/cm3 (calcite) 2.83 g/cm3 (aragonite)
Meltin pynt	825 °C (aragonite) 1339 °C (calcite)[1][2]
Bylin pynt	decomposes
Solubility in watter	0.0013 g/100 mL (25°C)[3]
Solubility product, Ksp	4.8×10−9[4]
Solubility in dilute acids	soluble
Acidity (pKa)	9.0
Refractive index (nD)	1.59
Structur
Creestal structur	Trigonal
Space group	32/m
Thermochemistry
Staundart molar entropy So298	93 J·mol−1·K−1[5]
Std enthalpy o formation ΔfHo298	−1207 kJ·mol−1[5]
Hazards
NFPA 704	0 1 0
Flash pynt	825 °C
Lethal dose or concentration (LD, LC):
LD50 (Median dose)	6450 mg/kg (oral, rat)
Relatit compoonds
Ither anions	Calcium bicarbonate
Ither cations	Magnesium carbonate Strontium carbonate Barium carbonate
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa).
Y verify (whit is YN ?)
Infobox references

References

1. "Prostadine".
2. "Occupational safety and health guideline for calcium carbonate" (PDF). US Dept. of Health and Human Services. Retrieved 31 Mairch 2011.
3. Gordon Aylward, Tristan Findlay. SI Chemical Data Book (4th ed.). John Wiley & Sons Australia, Ltd. ISBN 978-0-470-81638-7.
4. Patnaik, Pradyot (2003). Handbook of Inorganic Chemical Compounds. McGraw-Hill. ISBN 0-07-049439-8. Retrieved 6 Juin 2009.
5. Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A21. ISBN 0-618-94690-X.

Freemit airtins

• Internaitional Chemical Safety Caird 1193
• PubChem 516889
• ATC codes: A02AC01 (WHO) an A12AA04 (WHO)
• The British Calcium Carbonate Association – What is calcium carbonate Archived 2008-05-24 at the Wayback Machine
• CDC - NIOSH Pocket Guide tae Chemical Hazards - Calcium Carbonate