Magnesium hydroxide(Mg(OH)2) is a colorless hexagonal crystal that is almost insoluble in water and alcohol, and its aqueous solution is weakly alkaline. It is one of many salts of magnesium used clinically. The hydroxide and other salts such as carbonate, trisilicate, citrate, oxide and sulfate are used widely for relief of gastrointestinal symptoms of dyspepsia, heartburn, gastroesophageal reflux disease and constipation by acting as antacids and laxatives.

What is the Lewis Structure?

Lewis Structures, also called Electron Dot Structures, are important to learn because they help us understand how atoms and electrons are arranged in a molecule, such as Isopropyl alcohol. This can help us determine the molecular geometry, how the molecule might react with other molecules, and some of the physical properties of the molecule (like boiling point and surface tension).

Steps for drawing the Lewis structure of Mg(OH)2

Step 1: Count the total number of valence electrons

Magnesium contributes 2 valence electrons, and each hydrogen contributes 1, giving a total of 2 + (2 x 1) = 4 valence electrons.

Step 2: Determine the central atom and the framework

Magnesium (Mg) is the least electronegative atom and goes at the center of the Mg(OH)2 Lewis structure.

Step 3: Draw covalent bonds (shared electrons)

Connect each hydrogen atom to the central magnesium atom with a single bond (line) and distribute the remaining electrons as lone pairs around the hydrogen atoms.

Step 4: Assign lone pairs of electrons (satisfying the octet rule)

Ensure each hydrogen atom has 2 electrons (1 bonding pair and 1 lone pair), and the magnesium atom has 2 electrons (2 bonding pairs).

Step 5: Check stability

Formal charges may not be necessary as all atoms have achieved the octet rule.