Magnesium bicarbonate, also known by its IUPAC name magnesium hydrogen carbonate, is a salt containing bicarbonate anion and magnesium cation represented by the formula C2H2MgO6 or Mg(HCO3)2 . Since magnesium bicarbonate is unstable in a solid state, it exists in a dilute aqueous solution .
Magnesium Bicarbonate Identification
|CAS Number||2090-64-4 |
|PubChem CID||102204 |
|ChemSpider ID||92335 |
|EC Number||235-192-7 (EU Food Improvement Agents)
218-240-1 (ECHA) 
|InChI Key||QWDJLDTYWNBUKE-UHFFFAOYSA-L |
How is Magnesium Bicarbonate Prepared
It can be synthesized by treating magnesium acetate with sodium bicarbonate, involving the following reaction:
Mg(CH3COO)2 + 2NaHCO3 → Mg(HCO3)2 + 2CH3COONa
A solution of Mg(HCO3)2 commonly called magnesium bicarbonate water can be produced through the reaction of magnesium hydroxide (such as milk of magnesia) and pressurized carbon dioxide (like seltzer water) :
Mg(OH)2 + 2CO2 → Mg(HCO3)2
The resulting solution when dried decomposes magnesium bicarbonate into magnesium carbonate, water, and carbon dioxide:
Mg + 2HCO3 → MgCO3 + CO2 + H2O
Properties and Characteristics of Magnesium Bicarbonate
|Molar Mass/Molecular Weight||146.337 g/mol |
|Color and Appearance||Light, white, unstable friable mass or powder [1, 2]|
|Boiling Point||333.6 °C, 632.48 °F |
|Charge||0 (Mg2+ and HCO3–) |
|State of matter at room temperature||Unstable in solid form but exists in the liquid state |
|Solubility||Insoluble in ethanol |
|Solubility in Water||Almost insoluble in water (0.077 g per 100 mL) |
- Magnesium bicarbonate has numerous health benefits and is used for resisting changes in blood pH and keeping it within an optimal range .
- As an essential mineral, it helps in blood pressure regulation, protein synthesis, nerve and muscle functions, and blood glucose control in the human body .
- It is used as food additives like acidity regulators, alkali, anti-cracking and bleaching agents [1, 6].
- Carbonic Acid, Magnesium Salt (2:1) – Pubchem.ncbi.nlm.nih.gov
- Magnesium Bicarbonate – Mg(HCO3)2 – Byjus.com
- Magnesium Bicarbonate – Chemspider.com
- Preparation of Solutions of Magnesium Bicarbonate for Deacidification – Jstor.org
- Magnesium Bicarbonate Water – The importance of bicarbonates and magnesium – Dancingwithwater.com
- Acidity Regulators – Chm.bris.ac.uk