Definition of Acidity Constant from the PharmacyDictionary.in

Acidity Constant

Synonyms of Acidity Constant

The term “Acidity Constant” can refer to several concepts, depending on the context:

1. Ionization Constant of a Weak Acid: This is a measure of the degree of ionization of a weak acid in solution. It’s represented by the equilibrium constant (Ka) for the ionization reaction of the acid.

2. pKa: This is the negative logarithm (base 10) of the ionization constant of a weak acid (Ka). It’s a measure of the strength of an acid in solution. A lower pKa value indicates a stronger acid.

3. Sigma Constant of the Hammett Equation: In the context of the Hammett equation, which relates reaction rates of organic reactions to equilibrium constants, the sigma constant represents the electronic effect of substituents on the acidity of benzoic acid derivatives.

4. Equilibrium Constant for the Ionization of a Weak acid: This refers to the equilibrium constant for the reaction in which a weak acid (HA) donates a proton (H+) to water (H2O), forming its conjugate base (A-) and a hydronium ion (H3O+). This constant is typically represented as Ka and is related to the pH and pKa of the solution.

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