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Acid-Base Theory

Acid-base theory comprises complementary theoretical frameworks—primarily the Arrhenius, Brønsted-Lowry, and Lewis models—that define acidic and basic chemical behavior.

Type: Concept Domain: Chemistry Biology Medicine Era: 1923 — present

Overview

The Arrhenius model describes acid-base behavior through hydrogen and hydroxide ions in aqueous solution. The Brønsted-Lowry model broadens this definition to proton transfers between donor and acceptor species in any solvent. The Lewis model further generalizes acid-base interactions to electron-pair donation and acceptance, independent of proton participation. These frameworks provide the basis for calculating dissociation constants, pH scales, and buffer equilibria.

Why it matters

These theoretical models inform chemical synthesis, quantitative buffer formulation, and physiological pH regulation. They also supply the equilibrium equations required to model solution chemistry in environmental and industrial systems.

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