WHY AMMONIA IS A BASE

What is a Base?

In chemistry, a base is a substance that accepts protons (H+ ions) from another substance. This proton-accepting ability is typically attributed to the presence of a lone pair of electrons on the base molecule. When a base accepts a proton, it forms a new bond with the hydrogen ion, creating a new molecule.

The Brønsted-Lowry Definition of a Base

The Brønsted-Lowry definition of a base is a more specific definition that states that a base is a substance that can donate a pair of electrons to form a new covalent bond. This definition is more restrictive than the Lewis definition, as it requires the base to have a lone pair of electrons.

Properties of Bases

Bases have a number of characteristic properties, including:

• They are slippery to the touch.


• They taste bitter.


• They turn red litmus paper blue.


• They react with acids to form salts and water.


• They have a pH greater than 7.

Why is Ammonia a Base?

Ammonia (NH3) is a base because it has a lone pair of electrons on the nitrogen atom. This lone pair of electrons can accept a proton from another substance, forming a new bond with the hydrogen ion and creating a new molecule.

The Reaction of Ammonia with Water

When ammonia reacts with water, it forms ammonium hydroxide (NH4OH), which is a weak base. This reaction is reversible, and the equilibrium constant for the reaction is 1.8 x 10^-5. This means that at room temperature, only a small amount of ammonia will react with water to form ammonium hydroxide.

Uses of Ammonia

Ammonia is a versatile chemical compound with a wide range of applications. It is used in the manufacture of fertilizers, explosives, plastics, and dyes. It is also used as a cleaning agent and a refrigerant.

Conclusion

Ammonia is a base because it has a lone pair of electrons that can accept a proton from another substance. This proton-accepting ability gives ammonia a number of characteristic properties, including its slippery feel, bitter taste, and ability to turn red litmus paper blue. Ammonia is also a versatile chemical compound with a wide range of applications.

Frequently Asked Questions

1. What is the pH of ammonia?

The pH of a 1 M solution of ammonia is 11.63.

2. What are some common uses of ammonia?

Ammonia is used in the manufacture of fertilizers, explosives, plastics, and dyes. It is also used as a cleaning agent and a refrigerant.

3. What is the reaction of ammonia with water?

When ammonia reacts with water, it forms ammonium hydroxide (NH4OH), which is a weak base.

4. What are some of the properties of bases?

Bases are slippery to the touch, taste bitter, turn red litmus paper blue, react with acids to form salts and water, and have a pH greater than 7.

5. What is the Brønsted-Lowry definition of a base?

The Brønsted-Lowry definition of a base is a substance that can donate a pair of electrons to form a new covalent bond.