Calcium carbonate

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Calcium carbonate
Calcium carbonate.png
Calcium-carbonate-xtal-3D-SF.png
Calcium carbonate.jpg
Names
IUPAC name
Calcium carbonate
Ither names
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.006.765
EC Nummer 207-439-9
E nummer E170 (colours)
KEGG
RTECS nummer FF9335000
UNII
Properties
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]
Bylin pynt decomposes
0.0013 g/100 mL (25°C)[2]
Solubility product, Ksp 4.8×109[3]
Solubility in dilute acids soluble
Acidity (pKa) 9.0
Refractive index (nD) 1.59
Structur
Trigonal
Space group 32/m
Thermochemistry
Staundart molar
entropy
So298
93 J·mol−1·K−1[4]
Std enthalpy o
formation
ΔfHo298
−1207 kJ·mol−1[4]
Hazards
NFPA 704
Flammability code 0: Will nae burn. E.g., watterHealth code 1: Exposur would cause irritation but anly minor residual injury. E.g., turpentineReactivity code 0: Normally stable, even unner fire exposur condeetions, an is nae reactive wi watter. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
0
1
0
Flash pynt 825 °C
Lethal dose or concentration (LD, LC):
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).
YesY verify (whit is YesYN ?)
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, 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.

References[eedit | eedit soorce]

  1. "Occupational safety and health guideline for calcium carbonate" (PDF). US Dept. of Health and Human Services. Retrieved 31 Mairch 2011. 
  2. Gordon Aylward, Tristan Findlay. SI Chemical Data Book (4th ed.). John Wiley & Sons Australia, Ltd. ISBN 978-0-470-81638-7. 
  3. Patnaik, Pradyot (2003). Handbook of Inorganic Chemical Compounds. McGraw-Hill. ISBN 0-07-049439-8. Retrieved 2009-06-06. 
  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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