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1309-42-8

Basic Information
CAS No.: 1309-42-8
Name: Magnesium hydroxide
Article Data: 2
Cas Database
Molecular Structure:
Molecular Structure of 1309-42-8 (Magnesium hydroxide)
Formula: H2MgO2
Molecular Weight: 56.3038
Synonyms: Magnesia 50H;Magnesium dihydroxide;Magnesium(II) hydroxide;Magnifin A;Magnifin H 10;Magnifin H 5;Magshield S;Magshield UF-NB 10;Magstar;Magstar 5;Marinco H 1241;MgZ 1;Mint-O-Mag;N 0(curing accelerator);N 6 (hydroxide);Nittomagu S;Odomag;PT 25ST;PZ 1SP;PhillipsMilk of Magnesia Liquid;Reachim;S/G 84;SP (hydroxide);SX 30MS;StanMag Hydroxide B;StarBrand 100;Magnesum hydroxide;10A (hydroxide);200-06H;96HS;B 54;Combustrol 500;DSB 100;FD 905U;FM 70;FR 20/100;FR 20S10;Finemag SN-L;FloMag HUS;H 5;Hydrofy N;KX 4S;KX 8S(B);Ki 22-5B;Kisuma1;Kisuma 2;Kisuma 4AF;Kisuma 5;Kisuma 5A-N;Kisuma 5L;Kisuma 5Q;Kisuma 5X;Kiyouwasuimagu F;MGZ5;MH 3;MH 30;MS 4 (hydroxide);Maglux;Maglux ST;Maglux STF 2;
EINECS: 215-170-3
Density: 2.36 g/cm3
Melting Point: 350 °C(lit.)
Boiling Point: 100oC at 760mmHg
Flash Point: will not burn
Solubility: 0.9 mg/100 mL (18 °C) in water
Appearance: odourless white powder
Hazard Symbols: IrritantXi
Risk Codes: 36/37/38
Safety: 26-36-37/39
Transport Information: N/A
PSA: 40.46000
LogP: -0.35360
Synthetic route
7439-95-4

magnesium

A

(MgO)2

B

1309-42-8

magnesium dioxide

Conditions
ConditionsYield
In neat (no solvent) byproducts: MgO3; codeposition of pulsed laser evaporated Mg atoms with O2 in excess Ar on 10 K substrate; mechanism discussed; not isolated, detn. by IR;
7439-95-4

magnesium

1309-42-8

magnesium dioxide

Conditions
ConditionsYield
With N2 In neat (no solvent, gas phase) Kinetics; reaction over temp. range of 350-624 K in presence of N2 by static-flow reaction; detected by laser pulse / probe technique;
7439-95-4

magnesium

10024-97-2

dinitrogen monoxide

A

(MgO)2

B

1309-42-8

magnesium dioxide

Conditions
ConditionsYield
In neat (no solvent) byproducts: (OMgO)(N2), N2; codeposition of pulsed laser evaporated Mg atoms with N2O in excess Ar on 10 K substrate; mechanism discussed; not isolated, detn. by IR;
Raw Materials
7439-95-4
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Chemistry

IUPAC Name: magnesium dihydroxide 
Empirical Formula: H2MgO2
Molecular Weight: 58.3197g/mol
EINECS: 215-170-3 
Structure of Magnesium hydroxide (CAS NO.1309-42-8):

Melting Point: 350 °C(lit.)
Density: 2.36 g/cm3
Solubility: 5 M HCl: 0.1 M, clear, yellow
Water Solubility: 0.9 mg/100 mL (18 ºC)
Sensitive: Air Sensitive 
Stability: Stable. Enthalpy of Vaporization: 40.65 kJ/mol 
Vapour Pressure: 24.5 mmHg at 25°C 
Product Categories: Essential Chemicals;Reagent Grade;Routine Reagents;Chemical Synthesis;Inorganic Bases;Synthetic Reagents;12: Mg;Inorganic BasesMetal and Ceramic Science;MagnesiumMaterials Science;Nanomaterials;Nanoparticles: Oxides, Nitrides, and Other CeramicsNanomaterials;Nanopowders and Nanoparticle Dispersions;Oxides;Inorganics 
Canonical SMILES: [OH-].[OH-].[Mg+2]
InChI: InChI=1S/Mg.2H2O/h;2*1H2/q+2;;/p-2
InChIKey: VTHJTEIRLNZDEV-UHFFFAOYSA-L

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.
 

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)
 

Toxicity Data With Reference

1.    

orl-inf TDLo:2747 mg/kg:BAH

    JTCTDW    Journal of Toxicology, Clinical Toxicology. 29 (1991),215.
2.    

orl-rat LD50:8500 mg/kg

    DRUGAY    Drugs. International Journal of Current Therapeutics and Applied Pharmacology Reviews .(ADIS Press Ltd.,Wanchai, Hong Kong.: )1990,1131.
3.    

ipr-rat LD50:2780 mg/kg

    DRUGAY    Drugs. International Journal of Current Therapeutics and Applied Pharmacology Reviews .(ADIS Press Ltd.,Wanchai, Hong Kong.: )1990,1131.
4.    

orl-mus LD50:8500 mg/kg

    DRUGAY    Drugs. International Journal of Current Therapeutics and Applied Pharmacology Reviews .(ADIS Press Ltd.,Wanchai, Hong Kong.: )1990,1131.
5.    

ipr-mus LD50:815 mg/kg

    DRUGAY    Drugs. International Journal of Current Therapeutics and Applied Pharmacology Reviews .(ADIS Press Ltd.,Wanchai, Hong Kong.: )1990,1131.

Consensus Reports

Reported in EPA TSCA Inventory.

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: IrritantXi
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
Hazardous Substances Data: 1309-42-8(Hazardous Substances Data)

Specification

 Magnesium hydroxide , its cas register number is 1309-42-8. It also can be called Alcanex NHC 25 ; Asahi Glass 200-06 ;
 Baschem 12 ; Combustrol 500 ; Duhor ; Ebson RF ; FloMag H ; FloMag HUS ; Hydro-mag MA ; Hydrofy N ; Kisuma 4AF ; Kyowamag F ; Lycal 96 HSE ; Magmesia hydrate ; MagneClear 58 ; Magnesia magma ; Magox ; Marinco H ; Milk of magnesia ; Mint-O-Mag ; Nemalite ; Phillips Magnesia Tablets . Magnesium hydroxide (CAS NO.1309-42-8) is a odourless white powder.