Magnesium carbonate
Chemical compound / From Wikipedia, the free encyclopedia
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Magnesium carbonate, MgCO3 (archaic name magnesia alba), is an inorganic salt that is a colourless or white solid. Several hydrated and basic forms of magnesium carbonate also exist as minerals.
Quick Facts Names, Identifiers ...
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3D model (JSmol) |
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ChEBI | |
ChEMBL | |
ChemSpider |
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ECHA InfoCard | 100.008.106 |
E number | E504(i) (acidity regulators, ...) |
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CompTox Dashboard (EPA) |
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Properties | |
MgCO3 | |
Molar mass | 84.3139 g/mol (anhydrous) |
Appearance | Colourless crystals or white solid Hygroscopic |
Odor | Odorless |
Density | 2.958 g/cm3 (anhydrous) 2.825 g/cm3 (dihydrate) 1.837 g/cm3 (trihydrate) 1.73 g/cm3 (pentahydrate) |
Melting point | 350 °C (662 °F; 623 K) decomposes (anhydrous) 165 °C (329 °F; 438 K) (trihydrate) |
Anhydrous: 0.0139 g/100 ml (25 °C) 0.0063 g/100 ml (100 °C)[1] | |
Solubility product (Ksp) |
10−7.8[2] |
Solubility | Soluble in acid, aqueous CO2 Insoluble in acetone, ammonia |
−32.4·10−6 cm3/mol | |
Refractive index (nD) |
1.717 (anhydrous) 1.458 (dihydrate) 1.412 (trihydrate) |
Structure | |
Trigonal | |
R3c, No. 167[3] | |
Thermochemistry | |
Heat capacity (C) |
75.6 J/mol·K[1] |
Std molar entropy (S⦵298) |
65.7 J/mol·K[1][4] |
Std enthalpy of formation (ΔfH⦵298) |
−1113 kJ/mol[4] |
Gibbs free energy (ΔfG⦵) |
−1029.3 kJ/mol[1] |
Pharmacology | |
A02AA01 (WHO) A06AD01 (WHO) | |
Hazards | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
NIOSH (US health exposure limits): | |
PEL (Permissible) |
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Safety data sheet (SDS) | ICSC 0969 |
Related compounds | |
Other anions |
Magnesium bicarbonate |
Other cations |
Beryllium carbonate Calcium carbonate Strontium carbonate Barium carbonate Radium carbonate |
Related compounds |
Artinite Hydromagnesite Dypingite |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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