Arrhenius concept of acids and bases
Basic definitions of acids and bases based on the production of H+ and OH- ions in aqueous solutions.
What is Arrhenius concept of acids and bases?
A substance that dissociates in aqueous solution to produce hydrogen ions (H+).
Key formula / rule: Acid Dissociation (Arrhenius)
Key points
- Define acids and bases according to the Arrhenius theory.
- Identify examples of Arrhenius acids and bases.
- Explain the neutralization reaction in the context of the Arrhenius concept.
- Recognize the limitations of the Arrhenius theory.
Common exam trap
Forgetting that the Arrhenius concept applies only to aqueous solutions.
Definitions
- Term
Arrhenius Acid
- Meaning
A substance that dissociates in aqueous solution to produce hydrogen ions (H+).
- Term
Arrhenius Base
- Meaning
A substance that dissociates in aqueous solution to produce hydroxide ions (OH-).
- Term
Neutralization (Arrhenius)
- Meaning
The reaction between an Arrhenius acid and an Arrhenius base in aqueous solution, resulting in the formation of water and a salt.
Learning objectives
Define acids and bases according to the Arrhenius theory.
Identify examples of Arrhenius acids and bases.
Explain the neutralization reaction in the context of the Arrhenius concept.
Recognize the limitations of the Arrhenius theory.
Formulae
- Name
Acid Dissociation (Arrhenius)
- Note
HA represents an Arrhenius acid.
- Expression
HA(aq) → H+(aq) + A-(aq)
- Name
Base Dissociation (Arrhenius)
- Note
BOH represents an Arrhenius base.
- Expression
BOH(aq) → B+(aq) + OH-(aq)
- Name
Neutralization Reaction
- Note
The core reaction in Arrhenius neutralization.
- Expression
H+(aq) + OH-(aq) → H2O(l)
Prerequisites
Basic understanding of chemical dissociation.
Knowledge of ions (cations and anions).
Familiarity with aqueous solutions.
Common mistakes
Forgetting that the Arrhenius concept applies only to aqueous solutions.
Confusing H+ with hydronium ion (H3O+) without explicitly stating the formation of H3O+ from H+ and water.
Assuming all substances containing H are acids or all containing OH are bases without considering their dissociation in water.
Keywords
Arrhenius
Acid
Base
Aqueous solution
Hydrogen ion
Hydroxide ion
Neutralization
Dissociation
Practice preview
Which of the following substances acts as an Arrhenius base?…
easy
Which of the following statements is NOT true about the Arrhenius concept of acids and bases?…
medium
Which of the following is an example of an Arrhenius acid that is also a weak acid?…
medium