Magnesium hydroxide

Magnesium hydroxide
Magnesium hydroxide
Magnesium hydroxide
Names
IUPAC name
Magnesium hydroxide
Other names
  • Magnesium dihydroxide
  • Milk of magnesia
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
DrugBank
ECHA InfoCard 100.013.792 Edit this at Wikidata
EC Number
  • 215-170-3
E number E528 (acidity regulators, ...)
485572
KEGG
RTECS number
  • OM3570000
UNII
  • InChI=1S/Mg.2H2O/h;2*1H2/q+2;;/p-2 checkY
    Key: VTHJTEIRLNZDEV-UHFFFAOYSA-L checkY
  • InChI=1/Mg.2H2O/h;2*1H2/q+2;;/p-2
    Key: VTHJTEIRLNZDEV-NUQVWONBAW
  • [Mg+2].[OH-].[OH-]
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
  • 0.00064 g/100 mL (25 °C)
  • 0.004 g/100 mL (100 °C)
5.61×10−12
−22.1×10−6 cm3/mol
1.559[1]
Structure
Hexagonal, hP3[2]
P3m1 No. 164
a = 0.312 nm, c = 0.473 nm
Thermochemistry
77.03 J/mol·K
64 J·mol−1·K−1[3]
−924.7 kJ·mol−1[3]
−833.7 kJ/mol
Pharmacology
A02AA04 (WHO) G04BX01 (WHO)
Hazards
GHS labelling:
GHS07: Exclamation mark[4]
Warning[4]
H315, H319, H335[4]
P261, P280, P304+P340, P305+P351+P338, P405, P501[4]
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
0
0
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
8500 mg/kg (rat, oral)
Safety data sheet (SDS) External MSDS
Related compounds
Other anions
 Magnesium oxide
Other cations
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

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).[5] Magnesium hydroxide is a common component of antacids, such as milk of magnesia.

  1. ^ Patnaik, Pradyot (2003). Handbook of inorganic chemicals. New York: McGraw-Hill. ISBN 0-07-049439-8. OCLC 50252041.
  2. ^ Toshiaki Enoki and Ikuji Tsujikawa (1975). "Magnetic Behaviours of a Random Magnet, NipMg(1−p)(OH)2". J. Phys. Soc. Jpn. 39 (2): 317–323. Bibcode:1975JPSJ...39..317E. doi:10.1143/JPSJ.39.317.
  3. ^ a b Zumdahl, Steven S. (2009). Chemical Principles (6th ed.). Houghton Mifflin Company. p. A22. ISBN 978-0-618-94690-7.
  4. ^ a b c d "Magnesium Hydroxide". American Elements. Retrieved May 9, 2019.
  5. ^ Handbook of Chemistry and Physics (76th ed.). CRC Press. 12 March 1996. ISBN 0849305969.