Magnesium hydroxide
| Names | |
|---|---|
| IUPAC name
Magnesium hydroxide | |
Other names
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| Identifiers | |
3D model (JSmol) |
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| ChEMBL | |
| ChemSpider | |
| DrugBank | |
| ECHA InfoCard | 100.013.792 |
| EC Number |
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| E number | E528 (acidity regulators, ...) |
| 485572 | |
| KEGG | |
PubChem CID |
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| RTECS number |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| Mg(OH)2 | |
| Molar mass | 58.3197 g/mol |
| Appearance | White solid |
| Odor | Odorless |
| Density | 2.3446 g/cm3 |
| Melting point | 350 °C (662 °F; 623 K) decomposes |
| |
Solubility product (Ksp) |
5.61×10−12 |
| −22.1×10−6 cm3/mol | |
Refractive index (nD) |
1.559 |
| Structure | |
| Hexagonal, hP3 | |
| P3m1 No. 164 | |
a = 0.312 nm, c = 0.473 nm | |
| Thermochemistry | |
Heat capacity (C) |
77.03 J/mol·K |
Std molar entropy (S⦵298) |
64 J·mol−1·K−1 |
Std enthalpy of formation (ΔfH⦵298) |
−924.7 kJ·mol−1 |
Gibbs free energy (ΔfG⦵) |
−833.7 kJ/mol |
| Pharmacology | |
| A02AA04 (WHO) G04BX01 (WHO) | |
| Hazards | |
| GHS labelling: | |
| Warning | |
| H315, H319, H335 | |
| P261, P280, P304+P340, P305+P351+P338, P405, P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
8500 mg/kg (rat, oral) |
| Safety data sheet (SDS) | External MSDS |
| Related compounds | |
Other anions |
Magnesium oxide |
Other cations |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |
Magnesium hydroxide is an inorganic compound with the chemical formula Mg(OH)2. It occurs in nature as the mineral brucite. It is a white solid with low solubility in water (Ksp = 5.61×10−12). Magnesium hydroxide is a common component of antacids, such as milk of magnesia.