Magnesium nitrate Chemical Properties

Melting point:

648 °C(lit.)

Boiling point:

1090 °C(lit.)

Density 

0.889 g/mL at 25 °C

vapor pressure 

1 mm Hg ( 621 °C)

RTECS 

OM3756000

Flash point:

−26 °F

solubility 

H₂O: soluble

form 

turnings

color 

white cubic crystals, crystalline

Water Solubility 

Freely soluble in water. Moderately soluble in ethanol and ammonia.

Sensitive 

Hygroscopic

Merck 

13,5697

Exposure limits

ACGIH: TWA 2 ppm; STEL 4 ppm
OSHA: TWA 2 ppm(5 mg/m3)
NIOSH: IDLH 25 ppm; TWA 2 ppm(5 mg/m3); STEL 4 ppm(10 mg/m3)

CAS DataBase Reference

10377-60-3(CAS DataBase Reference)

EPA Substance Registry System

Magnesium nitrate (10377-60-3)

Safety Information

Hazard Codes 

C,Xi,O

Risk Statements 

34-36/37/38-8-36/38-35

Safety Statements 

43-7/8-26-17-36-45-36/37/39

RIDADR 

UN 2056 3/PG 2

WGK Germany 

-

TSCA 

Yes

HazardClass 

5.1

Hazardous Substances Data

10377-60-3(Hazardous Substances Data)

MSDS

• Language:English Provider:ACROS
• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

Magnesium nitrate Usage And Synthesis

Physical Properties

The anhydrous salt consists of white cubic crystals; density 2.3 g/cm3; very soluble in water. The dihydrate is white crystalline solid having density 1.45 g/cm3; decomposes at about 100°C; soluble in water and ethanol. The hexahydrate, MgNO3•6H2O is a colorless solid having monoclinic crystal structure and density 1.46 g/cm3. The salt is hygroscopic and very soluble in water and moderately soluble in ethanol.

Occurrence and Uses

The hexahydrate, Mg(NO3)2•6H2O, occurs in nature as mineral nitromagnesite. Magnesium nitrate is used in pyrotechnics; and in the manufacture of concentrated nitric acid to remove water and concentrate the acid vapors to 90–95% HNO3. It also is used to aid coating and prilling in production of ammonium nitrate. The salt also is used as an analytical standard for magnesium and a matrix modifier in furnace atomic absorption spectroscopic analysis. It also finds some limited application as a nitrogenous fertilizer.

Preparation

Magnesium nitrate is prepared by the action of nitric acid on magnesium carbonate, oxide or hydroxide:
MgCO3 + 2HNO3 → Mg(NO3)2 + CO2 + H2O
Mg(OH)2 + 2HNO3 → Mg(NO3)2 + 2H2O
The salt crystallizing at room temperature after evaporation is the hexahydrate, Mg(NO3)2•2H2O.

Reactions

Thermal decomposition of anhydrous Mg(NO3)2 yields magnesium oxide and nitrogen oxides. Heating the hexahydrate above its melting point forms basic nitrates, such as Mg(NO3)2•4 Mg(OH)2. The latter decomposes at 400°C, forming magnesium oxide and oxides of nitrogen. Magnesium nitrate forms addition compounds with a number of nitrogen-containing organics such as pyridine, aniline, and urea.

Description

Magnesium nitrate has the molecular formula of Mg(NO3)2 and the molecular weight of 148.3152 g/ mol.
Magnesium nitrate is prepared by the action of nitric acid on magnesium carbonate, oxide or hydroxide:
MgCO3 + 2HNO3 ? Mg(NO3)2 + CO2 +H2O
Mg(OH)2 + 2HNO3 ? Mg(NO3)2 + 2H2O
The salt crystallizing at room temperature after evaporation is the hexahydrate, Mg(NO3)2·6H2O. Two stable hydrates are formed, the hexahydrate [CAS number =13446-18-9] and the dihydrate, Mg(NO3)2· 2H2O [CAS number = 15750-45-5].

Chemical Properties

White crystals.Soluble in water and alcohol; deliquescent.

Chemical Properties

Magnesium nitrate is white crystalline solid.

Uses

In pyrotechnics; in the concentration of nitric acid.

Uses

It is used in printing, chemical, agriculture and ceramics industries. Its fertilizer grade has 10.5% nitrogen and 9.4% magnesium.

Preparation

The magnesium nitrate used in commerce has been synthesized in a variety of ways. The reaction between nitric acid and magnesium metal is one way and reaction with MgO is another. Magnesium hydroxide and ammonium nitrate also form the product but ammonia is released as a by-product:
2HNO3 + Mg Mg(NO3)2 +H2
2HNO3 + MgO Mg(NO3)2 +H2O
Mg(OH)2 + 2NH4NO3 Mg(NO3)2 + 2NH3 + 2H2O
Since magnesium nitrate has a high affinity for water, heating the hexahydrate does not result in the dehydration of the salt. Instead, it decomposes into magnesium oxide, oxygen and nitrogen oxides:
4Mg(NO3)2·6H2O + heat 4MgO + 2NO2 + 2N2O + O2 + 6H2O
Heating the hexahydrate above its melting point first forms basic nitrates, such as Mg(NO3)2·4Mg(OH)2. It is this salt that decomposes at 400 C, forming magnesium oxide and oxides of nitrogen. The absorption of these nitrogen oxides in water is one possible way to synthesize HNO3. Although it is inefficient, it does not require the use of another strong acid and the mineral, nitromagnesite, can be used in this context.

Definition

ChEBI: The inorganic nitrate salt of magnesium.

General Description

A white crystalline solid. Produces toxic oxides of nitrogen if heated to decomposition. Used in pyrotechnics.

Air & Water Reactions

Deliquescent. Water soluble.

Reactivity Profile

Mixtures of Magnesium nitrate with alkyl esters may explode owing to the formation of alkyl nitrates; mixtures with phosphorus, tin(II) chloride, or other reducing agents may react explosively [Bretherick 1979 p. 108-109]. Noncombustible but will accelerate the burning of combustible materials. If large quantities are involved in a fire or the combustible material is finely divided an explosion may result. Prolonged exposure to fire or heat may result in an explosion. Magnesium nitrate has been reported to undergo spontaneous decomposition in dimethylformamide [Bretherick 5th ed., 1995]. Magnesium nitrate tends to behave as a strong oxidizer.

Hazard

Dangerous fire and explosion risk in contact with organic materials, strong oxidizing agent.

Health Hazard

Exposure can cause mild irritation to the mucous membranes. Symptoms may include coughing and shortness of breath. Ingestion of large doses may cause dizziness, abdominal pain, vomiting, bloody diarrhea, weakness, convulsions, and collapse. Contact with skin may cause irritation, redness, and pain.

Flammability and Explosibility

Non flammable

Safety Profile

Probably a severe irritant to the eyes, skin, and mucous membranes. A powerful oxidizer. Violent decomposition on contact with dmethylformamide. When heated to decomposition it emits toxic fumes of NOx. See also NITRATES and MAGNESIUM COMPOUNDS.

Potential Exposure

Magnesium nitrate is used in fireworks and in the production of concentrated nitric acid.

First aid

If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts theskin, remove contaminated clothing and wash immediatelywith soap and water. Seek medical attention immediately. Ifthis chemical has been inhaled, remove from exposure,begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR ifheart action has stopped. Transfer promptly to a medicalfacility. When this chemical has been swallowed, get medical attention. Give large quantities of water and inducevomiting. Do not make an unconscious person vomit.Note to physician: Treat for methemoglobinemia.Spectrophotometry may be required for precise determination of levels of methemoglobin in urine.

storage

Color Code—Yellow: Reactive Hazard (strongoxidizer); Store in a location separate from other materials,especially flammables and combustibles. Prior to workingwith this chemical you should be trained on its proper handling and storage. Magnesium nitrate must be stored toavoid contact with dimethyl formamide, fuels, and strongreducing agents, since violent reactions occur. Store intightly closed containers in a cool, well-ventilated areaaway from flammable and combustible materials. Avoidstorage on wood floors. See OSHA Standard 1910.104 andNFPA 43A Code for the Storage of Liquid and SolidOxidizers for detailed handling and storage regulations.

Shipping

UN1474 Magnesium nitrate, Hazard Class: 5.1; Labels: 5.1-Oxidizer

Incompatibilities

A powerful oxidizer. Violent reaction with dimethylformamide, reducing agents; combustibles, fuels, organic and easily oxidizable matter

Magnesium nitrate(10377-60-3)Related Product Information

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• Magnesium sulfate
• Magnesium sulfate heptahydrate
• Magnesium oxide
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