What is the chemical formula for magnesium hydrogen carbonate?

Have you ever tried to impress your friends or colleagues by reciting the chemical formula for magnesium hydrogen carbonate? If not, it’s time to up your game! In this article, we will explore what exactly is magnesium hydrogen carbonate and break down its molecular structure once and for all!

Introduction: What Is Magnesium Hydrogen Carbonate?

Magnesium hydrogen carbonate (Mg(HCO3)2) is a compound that forms when magnesium hydroxide (Mg(OH)2) reacts with carbonic acid (H2CO3). This reaction occurs naturally in geological formations such as limestone caves where water containing dissolved carbon dioxide reacts with calcium carbonate.

Breaking Down the Molecular Structure of Mg(HCO3)2

Now let’s get into the fancy-schmancy science stuff! When Mg(HCO3)2 dissolves in water, it dissociates into its constituent ions. These ions are:

  • Mg^2+: A positively charged ion known as a cation.
  • (HCO3)^-: A negatively charged ion known as an anion.

The overall ionic equation can be written as follows:

Mg(HCO3)2 → Mg^2+ + 2 HCO3^- 

These ions go on to form complexes with other ions present in solution.

Properties of Magnesium Hydrogen Carbonate

Here are some exciting fun-facts about Mg(HCO3)2 that you probably didn’t know before:

Molar Mass of Magnesium Hydrogen Carbonate

The molar mass of Mg(HCO_₃)_₂ is approximately 230 grams per mole. This value can be calculated using the atomic masses of each element present in the molecule. For example, one mole of magnesium has a mass of approximately 24 grams while one mole of hydrogen carbonate has a mass of approximately 84 grams.

Solubility of Magnesium Hydrogen Carbonate

Mg(HCO3)2 is only slightly soluble in water, meaning that it does not dissolve easily. This property makes it difficult to study the compound’s reactivity with other substances.

Softening Water

Magnesium hydrogen carbonate can be used as a means for softening hard water (water containing high amounts of dissolved minerals such as calcium and magnesium). The compound forms solid magnesium hydroxide when treated with excess OH- ions present in a base like NaOH or KOH.

Applications of Magnesium Hydrogen Carbonate

Here are some exciting applications where you might come across Mg(HCO3)2:


Magnesium and calcium are two essential nutrients that plants need for growth. Farmers use Mg(HCO_₃)_₂ as fertilizer on their crops, especially those who grow legumes such as beans, peas or lentils.

Medical Purposes

In medicine,Magnesium supplements have been found to help treat conditions like muscle cramps, high blood pressure or even depression.


There you have it! You now know what magnesium hydrogen carbonate is – this magnificent chemical formula which combines three different elements into one amazing molecule. Who knew chemistry could be so interesting? Keep your eyes peeled for more fascinating gems from the world of science…who knows what discoveries await us next?!