The magnesium bromide formula i.e. MgBr2 is a formula of the chemical compound that is made up of the bromine i.e. Br and the magnesium i.e. Mg. The molecular or the chemical formula for the Magnesium bromide is MgBr2. Moreover, in its anhydrous form, it is a hygroscopic crystal that is white in colour and is hexagonal in shape. However, in its hexahydrate phase, it is a monoclinic crystal that has no colour.
We can prepare it by the process of treating the hydrobromic acid i.e. HBr with the magnesium oxide i.e. MgO and crystallizing the product. We can even synthesize it by the process of reacting to the magnesium carbonate i.e. MgCO3 and the hydrobromic acids i.e. HBr. Upon completing this process, it evaporates and the solid that is left is collected. It is soluble when we put it inside the water as well as in alcohol. It is naturally present in some of the minerals such as carnallite and the bischofite.
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Structure
An image showing its chemical structure is below in the common representations that we generally use for the organic molecules.
Image Source: pubchem.ncbi.nlm.nih.gov
Uses
The magnesium bromide (MgBr2) is useful as a catalyst for various types of reactions. The first one being a solvent-free 1 pot synthesis of the dihydropyrimidinones that we generally use in the pharmaceutical sectors. We use the dihydropyrimidinones in making the medicines such as the calcium channel blockers, and the HIV gp-120-CD4 inhibitors as well. It is also useful as a tranquillizer.
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The magnesium bromide (MgBr2) in combination with the CH2Cl2 catalyzes a reaction that results in the specific symmetry and chiral centres through the hydrogenation of the alkenes. The magnesium bromide (MgBr2) when bonds with the other functional groups have shown excess practical uses other than the catalyzing reactions. In addition, when bonded to an ethyl group we use it for the regiospecific analysis of the triglycerols.
The magnesium bromide (MgBr2) hexahydrate is being prepared to be used as a flame retardant. It was found that if 0.125 mol/L of magnesium bromide hexahydrate will be added to a cotton material it will act as a flame retardant as a result. The magnesium bromide synthesized the first stable magnesium silylenoid ever. A silylenoid is a compound that consists of the R2SiMX where M is metal and R is an organic moiety in this compound.
The magnesium silylenoid synthesizes through the addition of the magnesium bromide (MgBr2) to the lithium methyl bromosilylenoid. The magnesium atom exchanges the lithium in the complex and has a bromide attached to it. This complex is stable at room temperature.
Properties
The molecular weight of the magnesium bromide i.e. MgBr2 is 184.113 g/mol (anhydrous). Moreover, the density of the Magnesium bromide is about 3.72 g/cm3 (anhydrous). The magnesium bromide (MgBr2) has a melting point of about 711 °C, whereas, it has a boiling point of about 1250 °C.
Solved Example for You
Question: What amount of the mass of the magnesium bromide i.e. MgBr2 would we require for the process of preparing 720 ml of a 0.0939 M aqueous solution?
Solution:
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Molarity = M = mole/L
Let’s convert 720 mL to L (1000mL are in 1 L)
(0.0939 mol/L) × (0.72 L) = 0.0676 mol MgBr2
Now that we are having the mole magnesium bromide in an appropriate amount that we need. We will be using the molecular mass of the magnesium bromide (MgBr2) to calculate the mass that we need:
The molecular mass of the magnesium bromide (MgBr2) = (24.3 g/mol Mg) + 2(79.9 g/mol Br) = 184 g/mol MgBr2
(0.0676 mol MgBr2) × (184 g/mol MgBr2) = 12.4 g MgBr2.
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