Formation of Ammonium Ion

Inorganic chemistry is the branch or discipline of chemistry that deals with inorganic chemical compounds and the various reactions between them, along with their relative properties among different compounds. Inorganic compounds are generally chemical structures that do not possess a carbon-hydrogen bond. 

They do not have any properties related to organic molecules but can interact with them to produce various combinations of products. Inorganic compounds are metallic agents, minerals, and organometallic compounds. This study of science deals with the synthesis, behaviour, and various properties among such compounds. The formation of ammonium ions is one of the fundamental concepts covered in the inorganic chemistry branch.

Description

Classifying inorganic compounds

Inorganic compounds can be classified into various types based on their characteristic properties.

1. Acids

Acids are chemical compounds composed of hydrogen ions (H+) generated when dissolved in water. They possess a pH range between 0-6, which represents acidity. A few examples of acids are hydrochloric acids, nitric acid, citric acid, and sulphuric acid.

2. Bases

Bases are chemical compounds composed of hydroxyl ions (OH-) generated when dissolved in water. They possess a pH range between 8-14, which represents basicity or alkaline properties. Examples of bases are ammonia, sodium hydroxide, ammonium hydroxide, and soda-lime.

3. Salts

Salts are chemical compounds produced due to interactions between acids and bases by a reaction called the neutralisation reaction. They consist of both positive and negative ions. A few examples of salts are sodium chloride, potassium bromide, washing soda, and baking soda. 

Basic terms and definitions

• Ions

Ions are defined as atoms or molecules possessing a specific charge. They may be positively charged or negatively charged

• Anions

Anions are atoms or molecules having one or more negative electric charges. They are shortly referred to as negative ions, and their net negative charge is due to the presence of more electrons than protons. Therefore, they possess the property of gaining electrons from their surroundings. 

Example: Chlorine atom gains one electron and becomes Cl-, oxygen atom gains two electrons and becomes O2-.

• Cations

Cations are atoms or molecules having one or more positive electric charges. They are shortly referred to as positive ions, and their net positive charge is due to the presence of more protons than electrons. Therefore, they possess the property of losing electrons from their surroundings. 

Example: Silver atom loses an electron and gives Ag+, zinc atom loses two electrons and gives Zn2+.

Ammonium ions 

Ammonium ions are cations or positively charged polyatomic ions produced due to the protonation of ammonia molecules. They are inorganic chemical compounds that include tetrahedral nitrogen in their chemical structure. The chemical formula NH4+ represents them.

Formation of Ammonium Ion 

Ammonia atom (NH3) reacts with hydrogen ion (H+) to produce ammonium ion (NH4+) by forming a coordinate covalent bond. 

Covalent Bonding

The mutual sharing of one or more pairs of electrons between any two atoms results in forming a covalent bond. There is a balance in the stability of attractive and repulsive forces between the reacting atoms. One simple example for describing a covalent bond is the interaction between carbon and hydrogen to produce methane (CH4). 

Coordinate Bonding

Coordinate bonds are a specific type of covalent bonding that involves sharing both electrons from the same atom. The electron pair gets attracted by both the nuclei and causes the atoms to be in contact with each other. Coordinate bonding is also known as dative covalent bonding.

Ammonia 

Ammonia consists of nitrogen as the central atom possessing 5 electrons in its valence shell, where 3 electrons are shared with three hydrogen atoms and a lone pair of electrons.

Ammonia is said to be an electron-rich species that can donate its lone pair of electrons to another atom, making it a nucleophile. 

The reaction between Ammonia and Hydrochloric acid 

Ammonia reacts with hydrochloric acid to produce a thick white smoke of solid ammonium chloride

NH3 + HCl → NH4Cl

The next step involves the process of formation of ammonium chloride by the transfer of a hydrogen ion to the ammonia molecule possessing the lone pair of electrons.

NH3 + H+Cl– → NH4+ + Cl–

Conclusion 

Ammonium ions have a wide variety of applications in biological aspects. They are produced as a by-product of animal metabolism that gets converted into urea in mammals and sharks because urea is less toxic and can be stored effectively. Quaternary ammonium compounds composed of long alkyl chains such as benzalkonium chloride and sodium chloride have various pharmacological properties. 

They act as antibacterials, fungicides, and antiviral agents in the field of chemotherapy. They can also act as cleaning agents, disinfectants, diuretics, and surfactants. Ammonium salts also are capable of maintaining cellular osmotic pressure. The importance of the formation of ammonium ions is also described by acting as a potential nitrogen source for plant species that grow in hypoxic soils. 

It also acts as a plant growth regulator by inhibiting the production of auxins and gibberellins. Further details required to understand the meaning of the formation of ammonium ions and their properties are covered in this article.