Magnesium hydroxide , its cas register number is 1309-42-8. Magnesium hydroxide is a odourless white powder. Magnesium hydroxide is an inorganic compound with the chemical formula of hydrated Mg(OH)2. As a suspension in water, it is often called milk of magnesia because of its milk-like appearance. The solid mineral form of magnesium hydroxide is known as brucite.
1. Properties
Name:Magnesium hydroxide
EINECS:215-170-3
Molecular Formula:H2MgO2
CAS Registry Number:1309-42-8
InChI:InChI=1S/Mg.2H2O/h;2*1H2/q+2;;/p-2
Appearance:odourless white powder
Molecular Weight:58.33
Density:2.36g/cm3
Boiling Point:100°Cat760mmHg
Melting Point:350 C ( Decomposes)
Flash Point:will not burn
Storage Temperature:Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
Solubility:0.9 mg/100 mL (18 oC) in water
Stability:Stable.
Usage:Medication: antacid, cathartic.
2. Uses
Magnesium hydroxide is used industrially as a non-hazardous alkali to neutralise acidic wastewaters. Magnesium hydroxide takes part in the Biorock method of building artificial reefs. Magnesium hydroxide , in the form of Milk of Magnesia , is used as an antacid to neutralize stomach acid, and a laxative. The diarrhea caused by magnesium hydroxide carries away much of the body’s supply of potassium, and failure to take extra potassium may lead to muscle cramps. In addition it can be used as a non antiperspirant underarm (armpit) deodorant. It is also used in bleaching solutions to whiten clothes.
3. Production
Magnesium hydroxide is commercially available and there is no need to prepare it in the laboratory.
Magnesium hydroxide can be precipitated by the metathesis reaction between magnesium salts and sodium, potassium, or ammonium hydroxide:
Mg2+ (aq) + 2 OH (aq) → Mg(OH)2 (s)
4. Safety Profile
Moderately toxic by intraperitoneal route. Human systemic effects: chlorine level changes, coma, somnolence. Incompatible with maleic anhydride, phosphorus. See also Magnesium Compounds.
Hazard Codes: Xi
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36-37/39
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
RTECS: OM3570000
F: 3-9
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