Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
Kₐ, also known as the acid dissociation constant or acidity constant, represents the extent to which an acid donates its protons in a solution. It is used to determine the strength of weak acids.
Related terms
moles: Moles represent the unit for measuring the amount of substance. In chemistry, it is used to quantify atoms, molecules, or ions present in a sample.
M (molarity): Molarity represents the concentration of a solute in a solution. It is expressed in moles per liter (mol/L).
solution: A solution refers to a homogeneous mixture composed of two or more substances. It consists of a solvent (the component that dissolves other substances) and solutes (the components that are dissolved).