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Magnesium hydroxide

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Magnesium hydroxide
Magnesium hydroxide powder.jpgMagnesium hydroxide formula.png
Systematic name Magnesium hydroxide [1]
Other names Milk of magnesia [1]
Molecular formula Mg(OH)2 [1]
SMILES [Mg+2].[OH-].[OH-][1]
Molar mass Molar mass::58.3197 g/mol g/mol[1]
Appearance White solid [1]
CAS number CAS number::1309-42-8[1]
Density and phase Density::2.3446 g/cm2 g/ml, solid [1]
Solubility in water 0.004 g/100 ml (100°C) [1]
Melting point Melting point::350°C [1]
Basicity (pKb) 2.6[1]
Crystal structure Hexagonal, hP3[1]
MSDS Material safety data sheet
NFPA 704

NFPA 704 svg.png

Flash point Non-flammable[1]
Related compounds
Other anions Magnesium oxide[1]
Other cations

Beryllium hydroxide
Calcium hydroxide
Strontium hydroxide
Barium hydroxide[1]

Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Disclaimer and references

Magnesium Hydroxide, also known as the milk of magnesia is a chemical used for certain things. It is an inorganic compound, and it's chemical formula is, Mg(OH)2. It's first term for milk of magnesia was first used in 1872. Magnesium Hydroxide has been used as a antacid for upset stomach, indigestion, and heartburn. Also used for waste water treatment and fire retardant.


Magnesium Hydroxide powder on a plate.

Magnesium is a silver white and active metal. It has many compounds. Magnesium is part of the alkaline-earth metals. Researchers have figured that it connects with water pretty slow. Magnesium interacts with many kinds of acids. [2] Hydroxide is a chemical compound that contains the hydroxyl group. Inorganic hydroxides have hydroxides of metals, that are hydroxide and calcium hydroxide. Organic hydroxides have the alcohols. [3]

Magnesium Hydroxide is white powder, that is synthesized from seawater with the addition of calcium hydroxide (milk of lime). It is raw material of magnesium material. When it is in water it forms milk of magnesia. This milk of magnesia has been used as a antacid for stomach pain. [4] The formula for Magnesium Hydroxide is Mg(OH)2. For chemicals properties, the atomic number for Magnesium is 2, Hydrogen has 1, and oxygen has 16. Each of the elements has it's individual electronic configurations. Magnesium is [Ne] 3s2. Hydrogen is 1s1, and Oxygen is [He] 2s2 2p4. In metric the density is 2.34 g/cm3, and it's Molar mass is 58.83 g/mol. It's melting point is 350°C. [5]

Synthesis / Occurrences

Magnesium hydroxide powder in a tube.

Magnesium comes from magnesia. In compounds, magnesium usually has +2 oxidation state because of the sharing or loss of its two 3 electrons.[6]

The chemical formula for Magnesium Hydroxide is Mg(OH)2. It is an organic compound. When it dissolves in water, its big enough for it to dissolve to make ions in the solution, for the suspension.Magnesium Hydroxide can be used as a antacid and laxatives. It connects with the absorption of iron and folic acid. The antacid comes from hydroxide ions, which are in charge for neutralizing the acid. Brucite is the mineral for Magnesium Hydroxide.[7]


Magnesium Hydroxide is used as a big item production in our modern world. Magnesium Hydroxide powder can be used for waste water treatment and fire retardant. Also used for health treatments. [8] Magnesium is a natural mineral. It is important to many systems in our bodies, especially our nerves and muscles. [9]

Magnesium hydroxide, also known as the Milk of magnesia, can affect health treatment. It is a antacid and a laxatives. This antacid is known for reducing excess acid in the stomach. It helps remove heartburn, upset stomach, or indigestion. It usually comes as a tablet and liquid to by mouth. If you or anyone will take this medicine, always read the instructions for directions and more information for medical uses. Always ask your doctor. [10] Magnesium Hydroxide has also become a popular treatment for reducing oiliness of the skin. [11]


Kohn Callen, an American inventor, received a patent for Magnesium Hydroxide, on May 4, 1818. Sir James Murray used magnesia to treat the Lord Lieutenant of Ireland, from stomach pain, in 1829. It was amazing for James Murray because he was specified as a physician for two subsequent Lords Lieutenants and Anglesey, and was knighted. After his death in 1873, 2 years later, his fluid magnesia was invented.[12]

By Charles Henry Phillips, in 1872, the phrase milk of magnesia was first used for a white-colored, aqueous, mildly alkaline suspension of magnesium hydroxide. When it was sold, the brand name was always Phillips' Milk of Magnesia for medicinal usage. Milk magnesia may been used by another owner. USPTO registrations showed that "Milk of Magnesia" and "Phillips' Milk of Magnesia", are both registered to Bayer, owned by GlaxoSmithKline. The non brand name in the UK, for "Milk of Magnesia" and "Phillips' Milk of Magnesia" is "Cream of Magnesia."[1]


This video shows how to make Magnesium Hydroxide. Using common chemicals that can be found at home.


  1. 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 Magnesium hydroxide Wikipedia. Web. last modified on 7 December 2015. Unknown author.
  2. of Magnesium Use Of. Web. Accessed December 30, 2015. Unknown Author.
  3. Hydroxide Web. Accessed December 30, 2015. Houghton Mifflin.
  4. Magnesium Hydroxide Chemical Compound Encyclopedia Britannica. Web. Accessed December 27, 2015. Unknown Author.
  5. Hydroxide (Mg(OH)2) Nanoparticles - Properties, Applications The A to Z of Nanotechnology. Web. Accessed December 27, 2015. Unknown Author.
  6. [1] Encyclopedia Britannica. Web. Accessed January 13, 2015. Unknown Author.
  7. Magnesium Hydroxide Wikipedia. Web. Last-modified January 7, 2016. Unknown Author.
  8. Magnesium Hydroxide Powder Garrison Minerals. Web. Accessed 30, 2015. Unknown Author.
  9. Magnesium Hydroxide Web. Accessed December 27, 2015. Unknown Author.
  10. Magnesium Hydroxide WebMD. Web. Accessed December 27, 2015. Unknown Author.
  11. Milk of Magnesium Cures Earth Clinic. Web. Accessed January 2, 2015. Unknown Author.
  12. Magnesium Hydroxide Wikipedia. Web. Last-modified January 7, 2015. Unknown Author.