Oxides and Hydroxides

In hydroxides, a covalent bond links a hydrogen atom with an oxygen atom. The negative-charged hydroxide ion serves as a catalyst, nucleophile, ligand, base, etc. Hydroxide is also known as the hydroxyl radical, hydroxide ion, or hydroxyl ion.

An oxide is a chemical molecule that contains one or more oxygen atoms and another element. Most stable oxides, such as alumina (aluminium oxide), calcium oxide, and others, have oxygen in the -2 oxidation state.

Classification of oxides

Oxides are classified as basic, acidic, amphoteric or neutral, depending on their acid-base properties.

• A basic oxide is an oxide that produces a base in water [alkaline and alkali metal oxides].
• Acidic oxide is an oxide that forms an acid when it reacts with water [SO₃, CO₂, etc.].
• An amphoteric substance can react chemically as an acid or a base [Al₂O₃, PbO, SnO, etc.].
• Oxide can be neither acidic nor basic [CO, NO, NO₂, etc.].

Characteristics of Hydroxide

In hydroxide, two electrons share oxygen bonds with hydrogen. Hydroxide has a negative charge because an electron has been absorbed.

• Hydroxide – OH^–
• Conjugate base – Oxide anion
• Conjugate acid – Water
• Monoisotopic mass – 17.003 g/mol
• Molecular Weight – 17.007 g/mol

Important Hydroxide Compounds

The chemical formula of some important hydroxide compounds, and their applications, are given here.

Lithium hydroxide (LiOH)

In a test tube, lithium reacts with water to produce lithium hydroxide (LiOH) and hydrogen gas.

Applications of LiOH

Lithium hydroxide is used in a variety of applications.

• Several lithium compounds, such as lithium chloride, lithium iodide, lithium bromide, and lithium fluoride, use lithium hydroxide (LiOH) as a starting material.
• To absorb unwanted gas, LiOH is utilised.
• The spacecraft’s scrubbers use lithium hydroxide to remove carbon dioxide from the air.

Aluminium hydroxide (Al(OH)₃)

Aluminium hydroxide is a white, amorphous powder. It is soluble in alkaline and acidic solutions but not in water.

Uses of Al(OH)₃

Aluminium hydroxide has a variety of applications.

• Aluminium hydroxide is used to treat heartburn, stomach pain, aching stomach and acid indigestion.
• It’s also used to lower phosphate levels in people who have kidney disorders.

Magnesium hydroxide (Mg(OH)₂)

Magnesium hydroxide is a chemical compound with low water solubility. It’s also known as magnesium (2+) hydroxide or Milk of Magnesia.

Uses of Mg(OH)₂

• Magnesium hydroxide is a laxative that helps people with chronic constipation.
• Magnesium hydroxide is an antacid used to treat indigestion, heartburn, and acid reflux.

Zinc hydroxide [Zn(OH)₂]

Zinc hydroxide is an inorganic chemical with the formula Zn(OH)₂. Zinc hydroxide reacts with both bases and acids. When exposed to strong acid, it dissolves as an insoluble hydroxide.

Uses of zinc hydroxide

• The zinc hydroxide is utilised as a retentive in careful dressings.
• It’s utilised in the commercial production of pigments and pesticides as an intermediate.
• The zinc component is applied to big bandages used to engross blood from wounds during medical treatments.

Sodium hydroxide (NaOH)

At room temperature, sodium hydroxide is a solid ionic chemical compound. Other names for caustic soda include Iye, soda lye, and sodium hydrate. It is produced as a byproduct of the chlorine production process. In its finest form, it is a colourless crystalline solid. Properties of sodium hydroxide are,

Uses of NaOH

• Soaps and other detergents are made from sodium hydroxide.
• By combining chlorine with sodium hydroxide, chlorine bleach is produced.