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Magnesium nitrate

Basic information Physical Properties Occurrence and Uses Preparation Reactions Safety Related Supplier

Magnesium nitrate Basic information

Product Name:
Magnesium nitrate
CAS:
10377-60-3
MF:
MgN2O6
MW:
148.3148
EINECS:
231-104-6
Mol File:
10377-60-3.mol
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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
Water Solubility 
Freely soluble in water. Moderately soluble in ethanol and ammonia.
Sensitive 
Hygroscopic
Merck 
13,5697
CAS DataBase Reference
10377-60-3(CAS DataBase Reference)
EPA Substance Registry System
Magnesium nitrate (10377-60-3)
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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

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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

Magnesium nitrate is white crystalline solid.

Chemical Properties

White crystals.Soluble in water and alcohol; deliquescent.

Uses

In pyrotechnics; in the concentration of nitric acid.

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

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.

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.

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

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