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Magnesium Bicarbonate

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 [1]. Since magnesium bicarbonate is unstable in a solid state, it exists in a dilute aqueous solution [2].

Magnesium Bicarbonate Identification

CAS Number 2090-64-4 [1]
PubChem CID 102204 [1]
ChemSpider ID 92335 [3]
EC Number 235-192-7 (EU Food Improvement Agents)

218-240-1 (ECHA) [1]

UNII 19E9A0647O [1]

Magnesium Bicarbonate Formula

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) [4]:

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

Magnesium Bicarbonate

Properties and Characteristics of Magnesium Bicarbonate

General Properties

Molar Mass/Molecular Weight 146.337 g/mol [1]

Physical Properties

Color and Appearance Light, white, unstable friable mass or powder  [1, 2]
Odor Odorless [2]
Melting Point N/A
Boiling Point 333.6 °C, 632.48 °F [2]
Charge 0 (Mg2+ and HCO3) [1]
State of matter at room temperature Unstable in solid form but exists in the liquid state [2]
Solubility Insoluble in ethanol [1]
Solubility in Water Almost insoluble in water (0.077 g per 100 mL) [1]


  • Magnesium bicarbonate has numerous health benefits and is used for resisting changes in blood pH and keeping it within an optimal range [5].
  • As an essential mineral, it helps in blood pressure regulation, protein synthesis, nerve and muscle functions, and blood glucose control in the human body [5].
  • It is used as food additives like acidity regulators, alkali, anti-cracking and bleaching agents [1, 6].


  1. Carbonic Acid, Magnesium Salt (2:1) –
  2. Magnesium Bicarbonate – Mg(HCO3)
  3. Magnesium Bicarbonate –
  4. Preparation of Solutions of Magnesium Bicarbonate for Deacidification –
  5. Magnesium Bicarbonate Water – The importance of bicarbonates and magnesium –
  6. Acidity Regulators –

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