Site Map
  Calcium Carbonate Index for
Calcium 		Shopping
Carbonate 		Limousines in
Calcium 		Website Links For
Calcium 		 

Information About

Calcium Carbonate
APPAREL
BABY
BEAUTY
BOOKS
CAR TOYS
CELL PHONES
DVD'S
ELECTRONICS
GOURMET FOOD
GROCERIES
HEALTH & PERSONAL
HOME & GARDEN
JEWELRY
MUSIC
MUSIC INSTRUMENTS
OFFICE PRODUCTS
SOFTWARE
SPORTING GOODS
TOOLS & HARDWARE
TOYS
VIDEO GAMES
SHOPPING HOME
MORE SHOPPING...



! | Calcium Carbonate
|-
| align="center" colspan="2" bgcolor="#ffffff" |
|-
! | General
|-
| Systematic Name
| Calcium carbonate
|-
| Other names
| Limestone ,
Calcite ,
Aragonite
|-
| Molecular Formula
| CaCO3
|-
| Molar Mass
| 100.087 g/mol
|-
| Appearance
| White powder.
|-
| CAS Number
| {Link without Title}
|-
! | Properties
|-
| Density and Phase
| 2.83 g/cm3, solid.
|-
| Solubility in Water
| Insoluble
|-



| Melting Point
| 825°C (? K)
|-
| Boiling Point
| Decomposes
|-
| Acidity (p''K''a)
| ?
|-
| Basicity (p''K''b)
| ?
|-
! | Structure
|-
| Molecular Shape
| Linear
|-
| Coordination
geometry
| Tetrahedral
|-
| Dipole Moment
| ? D
|-
! | Hazards
|-
| MSDS
| External MSDS
|-
| Main Hazard s
| Not hazardous.
|-
| NFPA 704
|
|-
| Flash Point
| Non-flammable.
|-
| R/S Statement
| : ,
|-
| RTECS number
| ?
|-
! | Supplementary Data Page
|-
| Structure And
properties
| ''n'' , εr , etc.
|-
| Thermodynamic
data
| Phase behaviour
Solid, liquid, gas
|-
| Spectral Data
| UV , IR , NMR , MS
|-
! | Related compounds
|-
| Other Anion s
| Calcium Bicarbonate
Calcium Sulfate
|-
| Other Cation s
| Magnesium Carbonate
Strontium Carbonate
|-
| Related compounds
| Calcium Oxide
|-
| | Except where noted otherwise, data are given for
materials in their
|-
|}

Calcium carbonate is a Chemical Compound , with Chemical Formula Ca C O 3. It is commonly used medicinally as a Calcium supplement or as an Antacid . Calcium carbonate is the active ingredient in Agricultural Lime . It is a common substance found as Rock in all parts of the world and is the main component of Seashell s and the shell of Snail s.


Occurrence

Calcium carbonate is found naturally as the following Mineral s and rocks:

Eggshells are composed of approximately 95% calcium carbonate.

To test whether a mineral or rock contains calcium carbonate, strong acids like Hydrochloric Acid can be dropped with a dropper onto it. If it does contain the chemical, it will fizz and produce carbon dioxide; otherwise, it probably wouldn't react vigorously. For example, all of the rocks/mineral mentioned above will react with acid.


Preparation

The vast majority of calcium carbonate used in industry is extracted by mining or quarrying. When pure calcium carbonate is required (e.g. for food or pharmaceutical use), it is prepared by passing Carbon Dioxide into a solution of Calcium Hydroxide : the calcium carbonate precipitates out, and this grade of product is referred to as a precipitate.
:Ca(OH)2 + CO2 → CaCO3 + H2O


Chemical properties

See also: Carbonate

Calcium carbonate shares the typical properties of other carbonates. Notably:
#it reacts with strong acids, releasing carbon dioxide.
::CaCO3 + 2HCl → CaCl2 + CO2 + H2O
#it releases carbon dioxide on heating (to above 825 °C in the case of CaCO3), to form Calcium Oxide .
::CaCO3 → CaO + CO2

Calcium carbonate will react with water that is saturated with carbon dioxide to form the soluble Calcium Bicarbonate .
:CaCO3 + CO2 + H2O → Ca(HCO3)2

This reaction is important in the Erosion of Carbonate Rock s, forming Cavern s, and leads to Hard Water in many regions.


Uses

The main use of calcium carbonate is in the construction industry, either as a building material in its own right (e.g. Marble ) or as an ingredient of Cement .

Calcium carbonate is widely used medicinally as an inexpensive calcium supplement, Antacid , and/or Phosphate Binder . It is also used in the pharmaceutical industry as a base material for Tablet s of other pharmaceuticals.

Calcium carbonate is known as ''whiting'' in Ceramics /glazing applications, where it is used as a common ingredient for many glazes in its white powdered form. When a glaze containing this material is fired in a kiln, the whiting acts as a Flux material in the glaze.

It is commonly called Chalk as it has been a major component of blackboard chalk. Chalk may consist of either calcium carbonate or Gypsum , hydrated Calcium Sulfate CaSO4·2H2O.

Recently, calcium carbonate has begun to replace Kaolin in the production of glossy paper.

It is also the substance from which the Lens of the mammalian Eye is made.

In 1989, Dr. Simmons introduced CaCO3 into the Whetstone Brook in Massachusetts. His hope was that the calcium carbonate would counter the acid in the stream from acid rain and save the trout that had ceased to spawn. Although his experiment was a success, it did increase the amounts of aluminum ions in the area of the brook that was not treated with the limestone. This shows that CaCO3 can be added to neutralize the affects of acid rain in river ecosystems.

As a Food Additive , it is used in some Soy Milk products.


External links