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Calcium oxide

Properties, data and information sources.

 

Contents

Names and Identifiers

Name
Calcium oxide
Formula
CaO
Molar mass
56.077 (g/mol)
CAS registry number
1305-78-8
EC number EINECS
215-138-9
InChI Key
ODINCKMPIJJUCX-UHFFFAOYSA-N

Systematic name
Oxocalcium

Other names, synonyms
Lime; Quicklime; Burnt lime; Unslaked lime; Free lime; Caustic lime; Pebble lime; Calcia; Oxide of calcium

INCI name
CALCIUM OXIDE

 

Chemical formulas

Molecular formula and structural formula of Calcium oxide:

 

CaO

Mr = 56.077 g/mol

Oxocalcium
SMILES: O=[Ca]

 

Data and Properties

In its pure state, calcium oxide is a white, odorless powder.

solubility:
- Poorly soluble in water (1.65 g/L at 20°C, vigorous reaction).
melting point
2580 °C
boiling point
2850 °C
density
3.34 g cm-3 at 20 °C
magnetic susceptibility χ
-15.0 × 10-6 cm3 mol-1

 

Percentage and isotopic composition:

Mass-related elemental composition and isotope proportions of the compound Calcium oxide - CaO - calculated based on molecular mass.

Symbol
Element E
Number x
of atoms Ex
Data of the element
and isotopes *
Percentages
of isotopes
Percentage of
Ex in formula mass
Ca
Calcium
1ΣAr = 40.078 u
40Ca: 39.96259 u [96,941 %]
41Ca: 40.96228 u [<< 1 %]
42Ca: 41.95862 u [0,647 %]
43Ca: 42.95877 u [0,135 %]
44Ca: 43.95548 u [2,086 %]
46Ca: 45.95369 u [0,004 %]
48Ca: 47.95252 u [0,187 %]
 
40Ca: 69.28333 %
41Ca: trace
42Ca: 0.46241 %
43Ca: 0.09648 %
44Ca: 1.49086 %
46Ca: 0.00286 %
48Ca: 0.13365 %
71.4696 %O
Oxygen
1ΣAr = 15.999 u
16O: 15.99491 u [99,757 %]
17O: 16.99913 u [0,03835 %]
18O: 17.99916 u [0,205 %]
 
16O: 28.46108 %
17O: 0.01094 %
18O: 0.05849 %
28.5304 %

*) The third column lists the atomic masses or isotope masses of the elements involved and - in square brackets - the natural isotope composition.

 

More calculated data

The molar mass is M = 56.077 grams per mole.

The amount of substance in one kilogram of the substance is n = 17.833 mol.

The amount of substance in one gram of the substance is n = 0.018 mol.

Monoisotopic mass: 55.957505519 Da - related to 40Ca16O.

 

Use in food

E-Nummer: E529

Approved food additive with the E number E529.

EU: Status and regulations see EU Food Additives DB Ref. Number 3226.

 

Use in Cosmetics

INCI Name: CALCIUM OXIDE

Calcium oxide is an ingredient in cosmetic products, functioning as a buffering agent.

Source: CosIng (Cosmetic Ingredient Database) number: 74908.

 

Hazard warnings according to GHS

(General information without guarantee of accuracy and completeness! The information does not replace the chemical safety data sheet or a risk assessment, but rather provides a general overview of the risk posed by the hazardous substance.

Signal word: Danger

GHS hazard statements (H phrases):


H302
Harmful if swallowed

H314
Causes severe skin burns and eye damage

H315
Causes skin irritation

H318
Causes serious eye damage

H335
May cause respiratory irritation

Labeling in the EU: See ECHA Substance Infocard 100.013.763.

For toxicology and occupational safety when handling Calcium oxide as well as measures to be taken in case of danger, see: Hazardous Substances Information System GESTIS, ZVG-Nr. 001200.

International Chemical Safety Card ICSC (SDS, MSDS): See ICSC: 0409.


Note: The labeling requirement according to the CLP Regulation (EU) does not apply, among other things, to certain substances and mixtures for end users that are in the form of finished products, such as pharmaceuticals, veterinary drugs, cosmetics, certain medical products and medical devices, food or feed, as well as certain Food additives or flavorings. Special legal regulations may need to be adhered to here.

 

External Sources

PubChem:ID 14778ChemSpider:ID 14095Kegg database DBGET:ID D01679UNII of the FDA (USA):Unique Ingredient Identifier C7X2M0VVNHEPA CompTox Chemicals Dashboard:DTXSID5029631Other CAS RN:104624-96-6; 12610-14-9; 245321-52-2; 2529596-16-3; 2641773-61-5; 2721380-79-4; 2982928-23-2; 60873-85-0 (also used, outdated or deleted registration numbers)

 

Manufacturers and Sources of Supply

The table below lists producers and suppliers of Calcium oxide as a commercial chemical for laboratories, research, industry and production with the corresponding contact details.

 

Literature Sources

[0] - Specialist and research articles in scientific journals via PubMed: Calcium_oxide.

 


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