Calcium carbonate

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Calcium carbonate
Identifiers
CAS number 471-34-1 YesY
PubChem 10112
ChemSpider 9708 YesY
UNII H0G9379FGK YesY
EC nummer 207-439-9
KEGG D00932 YesY
ChEBI CHEBI:3311 YesY
ChEMBL CHEMBL1200539 N
RTECS nummer FF9335000
ATC code A02AC01,A12AA04
Jmol-3D images Image 1
Image 2
Properties
Molecular formula CaCO3
Molar mass 100.0869 g/mol
Appearance Fine white pouder; chalky taste
Odor odorless
Density 2.711 g/cm3 (calcite)
2.83 g/cm3 (aragonite)
Meltin pynt

825 °C (aragonite)
1339 °C (calcite)[2]

Boilin pynt

decomposes

Solubility in water 0.0013 g/100 mL (25°C)[3]
Solubility product, Ksp 4.8×10−9[1]
Solubility in dilute acids soluble
Acidity (pKa) 9.0
Refractive index (nD) 1.59
Structure
Crystal structur Trigonal
Space group 32/m
Thermochemistry
Std enthalpy o
formation
ΔfHo298
−1207 kJ·mol−1[4]
Staundart molar
entropy
So298
93 J·mol−1·K−1[4]
Hazards
MSDS ICSC 1193
EU Index Nae leetit
NFPA 704
NFPA 704.svg
0
1
0
Flash pynt 825 °C
LD50 6450 mg/kg (oral, rat)
Related compounds
Ither anions Calcium bicarbonate
Ither cations Magnesium carbonate
Strontium carbonate
Barium carbonate
Relatit compoonds Calcium sulfate
 N (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

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, pearls, 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.

References[eedit | eedit soorce]

  1. Patnaik, Pradyot (2003). Handbook of Inorganic Chemical Compounds. McGraw-Hill. ISBN 0-07-049439-8. Retrieved 2009-06-06. 
  2. "Occupational safety and health guideline for calcium carbonate". US Dept. of Health and Human Services. Retrieved 31 March 2011. 
  3. Gordon Aylward, Tristan Findlay. SI Chemical Data Book (4th ed.). John Wiley & Sons Australia, Ltd. ISBN 978-0-470-81638-7. 
  4. 4.0 4.1 Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. p. A21. ISBN 0-618-94690-X. 

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