Magnesium nitrate

Magnesium Nitrate

Magnesium nitrate

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Magnesium nitrate is a hygroscopic salt with the formula Mg(NO<sub>3</sub>)<sub>2</sub>. In air, it quickly forms the hexahydrate with the formula Mg(NO<sub>3</sub>)<sub>2</sub>·6H<sub>2</sub>O (and molar weight of 256.41 g/mol). It is very soluble in both water and ethanol.


Magnesium nitrate occurs in mines and caverns as nitromagnesite. This form is not common, although it may be present where guano contacts magnesium-rich rock. It is used in the ceramics, printing, chemical and agriculture industries. Its fertilizer grade has 10.5% nitrogen and 9.4% magnesium, so it is listed as 10.5-0-0 + 9.4% Mg. Fertilizer blends containing magnesium nitrate usually have ammonium nitrate, calcium nitrate, potassium nitrate and micronutrients; these blends are used in the greenhouse and hydroponics trade.


The magnesium nitrate used in commerce is a man-made product. It can be synthesized in a variety of ways. The reaction between nitric acid and magnesium metal

2 HNO<sub>3</sub> + Mg → Mg(NO<sub>3</sub>)<sub>2</sub> + H<sub>2</sub>

or magnesium oxide

2 HNO<sub>3</sub> + MgO → Mg(NO<sub>3</sub>)<sub>2</sub> + H<sub>2</sub>O

results in magnesium nitrate.

Magnesium hydroxide and ammonium nitrate also react to form magnesium nitrate as ammonia is released as a by-product.

Mg(OH)<sub>2</sub> + 2......

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