Dissociation constant The equilibrium

Section 19.1 discusses the Brpnsted theory of acids and bases, which extends the concepts of add and base beyond aqueous solutions and also explains the acidic or basic nature of solutions of most salts. Dissociation constants, the equilibrium constants for the reactions of weak acids or bases with water, are introduced in Section 19.2. The concept of the ionization of covalent compounds is extended to water itself in Section 19.3, which also covers pH, a scale of acidity and basicity. Section 19.4 describes buffer solutions, which resist change in their acidity or basicity even when some strong acid or base is added. Both the preparation and the action of buffer solutions are explained. Section 19.5 discusses the equilibria of acids containing more than one ionizable hydrogen atom per molecule. 

Many handbooks list dissociation constants (the equilibrium constant for the dissociation of acid into a proton and its conjugate base) as pKa s. 

Acid dissociation constant, The equilibrium constant for the dissociation reaction of a weak acid. 

Dissociation constant The equilibrium constant that applies to the dissociation of a complex ion into a simple ion and coordinating species (ligands). 

Dissociation constant - The equilibrium constant for a chemical reaction in which a compound dissociates into its constituent parts. 

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