Arrhenius Acid: Overview, Questions, Preparation

Basicity of an Arrhenius acid is termed because of the number of replaceable hydrogen ions found in an acid. As an instance, Phosphoric acid (H3PO4) ionises in its aqueous answer and offers three hydrogen ions; thus, phosphoric acid's basicity is three.

H3PO4 → H+ + H2PO4–

H3PO4– → H+ + HPO42-

HPO42- → H+ + PO43-

some different examples are as follows:

HCl , HNO3 , HClO4 , H3PO2 , H3BO3 (Monobasic acid (basicity = 1))

(COOH)2, H2SO4, H2SO3, H3PO3 (Dibasic acid (Basicity = 2)

H3PO4 (Tribasic acid (Basicity = 3)

Arrhenius, who became seeking to find out why certain solutions ought to conduct an electric contemporary, discovered that conductivity arose from the presence of ions. He discovered that when the substances HCl, HNO3, and H2SO4 were dissolved in water, they behave as robust electrolytes. This turned into the result of ionisation reactions in water.

As these substances are sturdy electrolytes that produce H+ ions, they are called sturdy acids. This was the result of ionisation reactions in water.

1. Strong acid

Robust acids get completely ionised in an aqueous answer and grow the protons (H+) inside the solution.

HA ↔ H+ + A–

The equilibrium constant for the dissociation of acid is known as acid dissociation regular (Ka). The significance of Ka may be very excessive for strong acids. For this reason, the strength of an acid is at once proportional to the acid dissociation regular (Ka).

2. Weak Acid

Because of their partial or incomplete dissociation, Susceptible acids do not launch hydrogen ions and, for that reason, exist as an equilibrium aggregate of undissociated acid in conjunction with the ions released for the duration of the partial dissociation. The range of hydrogen ions is shallow, and they display an excessive pH fee compared to strong acids. The acid dissociation constant is less for vulnerable acids in comparison to strong acids.

In Class 11: In the category of chemistry, in chapter Equilibrium, Arrhenius acid has been discussed thoroughly, with the detailed chapter and reactions, where the chapter has the weightage of 20 Marks.

1. Explain the Arrhenius reaction of LiOH

Answer: 

2. What is the advantage of Arrhenius acid?

Answer: It explains phenomena like neutralisation, salt hydrolysis, and strength of acid and bases.

3. What will be the reaction between Arrhenius acid and Arrhenius base?

Answer: The reaction will cause the formation of water and salt.