Main Difference – Magnesium Oxide vs Magnesium Citrate
Magnesium is an alkaline earth metal that is in the group 2 of the periodic table of elements. It can form many basic compounds. Magnesium often forms ionic compounds by forming the magnesium divalent cation. Magnesium oxide is one such ionic compound. It is a white solid. Magnesium Citrate is a complex compound that is the magnesium salt of the citric acid. It is used as a magnesium supplement. The main difference between magnesium oxide and magnesium citrate is that magnesium oxide in an ionic compound whereas magnesium citrate is a salt of magnesium.
Key Areas Covered
1. What is Magnesium Oxide
– Definition, Chemical Properties
2. What is Magnesium Citrate
– Definition, Chemical Properties and Uses
3. What is the Difference Between Magnesium Oxide and Magnesium Citrate
– Comparison of Key Differences
Key Terms: Citric Acid, Hygroscopic, Ionic, Magnesium, Citrate, Magnesium Oxide, Salt
What is Magnesium Oxide
Magnesium Oxide is an inorganic compound that has the chemical formula MgO. The molar mass of this compound is 40.304 g/mol. It is a white powder that is hygroscopic. This means it can absorb water from the air when exposed to the atmosphere.
Magnesium oxide is odorless and has a boiling point of 3600oC. The melting point of this compound is about 2800oC. A saturated solution of magnesium oxide has a pH value of 10.3. Therefore, it is a basic compound.
Magnesium oxide is an ionic compound composed of magnesium ions and oxide ions in a lattice. There are ionic bonds in between cations and anions. When this compound is added to water, it forms magnesium hydroxide. But when magnesium hydroxide is heated, it gives magnesium oxide again. Magnesium oxide can be produced by calcination of magnesium carbonate or magnesium hydroxide.
What is Magnesium Citrate
Magnesium citrate is a magnesium salt of citric acid, having the chemical formula C6H6MgO7. The molar mass of this compound 214.41 g/mol. The IUPAC name of magnesium citrate is Magnesium 2-hydroxypropane-1,2,3-tricarboxylate. Magnesium citrate is available as a white powder.
Magnesium citrate contains one magnesium cation per citrate anion. But sometimes, other magnesium salts such as trimagnesium citrate also are called magnesium citrate; hence it is a common name. However, magnesium citrate (containing one magnesium cation) is more water soluble than other magnesium citrate salts and is less alkaline.
There are many different applications of magnesium citrate in different areas. For example, magnesium citrate is a food additive that is used to regulate the acidity of food items. In medicine, it is used as saline laxative (a substance used to loosen stools, and avoid constipation). Apart from that, it is used as a dietary supplement because it contains about 11.23% magnesium by weight. It is available in pill form when used as a dietary supplement.
Difference Between Magnesium Oxide and Magnesium Citrate
Magnesium Oxide: Magnesium Oxide is an inorganic compound that has the chemical formula MgO.
Magnesium Citrate: Magnesium citrate is a magnesium salt of citric acid having the chemical formula C6H6MgO7.
Magnesium Oxide: The molar mass of Magnesium Oxide is 40.304 g/mol.
Magnesium Citrate: The molar mass of Magnesium citrate is 214.41 g/mol.
Magnesium Oxide: Magnesium Oxide is highly hygroscopic.
Magnesium Citrate: Magnesium citrate is less hygroscopic.
Magnesium Oxide: Magnesium Oxide is highly alkaline.
Magnesium Citrate: Magnesium citrate is less alkaline.
Magnesium Oxide: Magnesium Oxide is an ionic compound.
Magnesium Citrate: Magnesium citrate is a magnesium salt of citric acid.
Magnesium oxide and magnesium citrate are inorganic compounds that are used as magnesium supplements. But they are different from each other due the chemical structure and physical properties. The main difference between magnesium oxide and magnesium citrate is that magnesium oxide in an ionic compound whereas magnesium citrate is a salt of magnesium.
1. “MAGNESIUM CITRATE.” National Center for Biotechnology Information. PubChem Compound Database, U.S. National Library of Medicine, Available here.
2. “Magnesium oxide.” Wikipedia, Wikimedia Foundation, 6 Jan. 2018, Available here.
3. “MAGNESIUM CITRATE.” MAGNESIUM CITRATE | 144-23-0, Available here.
1. “Magnesium oxide” By Walkerma assumed -Own work assumed (based on copyright claims) (Public Domain) via Commons Wikimedia
2. “Magnesium citrate” By Edgar181 – Own work (Public Domain) via Commons Wikimedia