Magnesium Bicarbonate - Mg(HCO3)2

What is Magnesium Bicarbonate?

Magnesium Bicarbonate is an unstable compound of magnesium in solid state with the formula Mg(HCO3)2, it exists only in solutions. It exists only in solution and is formed by the action of water containing free carbon dioxide on magnesite, dolomite, dolomitic limestone and other minerals containing magnesium carbonate. It causes temporary hardness in water and on heating it easily decomposes back to carbonate.

IUPAC name – Magnesium hydrogen carbonate

Mg(HCO3)2 Magnesium Bicarbonate
pH 8.3
Molecular Weight/ Molar Mass 146.3387
Boiling Point 333.6 °C at 760 mmHg
Chemical Formula C2H2MgO6

Magnesium Bicarbonate Structure – Mg(HCO3)2

Magnesium Bicarbonate

Physical Properties of Magnesium Bicarbonate – Mg(HCO3)2

Odour Odourless
Appearance Found only in liquid form
Monoisotopic Mass 145.97 g/mol
Charge +2
Solubility Soluble in water to 5.7 g / 100 mL at 20oC

Chemical Properties of Magnesium Bicarbonate – Mg(HCO3)2

    • Magnesium Bicarbonate undergoes decomposition forming magnesium carbonate, water and free carbon dioxide.

Mg(HCO3)2 → MgCO3 + H2O + CO2

Uses of Magnesium Bicarbonate – Mg(HCO3)2

  • Used as an antacids decrease hyperacidity in conditions such as peptic ulcer disease, reflux esophagitis, gastritis and hiatal hernia.
  • Used to treat patients with renal insufficiency and should be given cautiously during pregnancy and breastfeeding.
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