Written by the Fiveable Content Team โข Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 examโขWritten by the Fiveable Content Team โข Last updated September 2025
Definition
Ka2 refers to the acidity constant associated with the second ionization of citric acid. It measures how easily the second hydrogen ion (H+) can be removed after one has already been removed during ionization.
Related terms
Ionization: The process by which an atom or molecule gains or loses electrons, forming ions.
Acidity Constant: A numerical value indicating the degree of acidity or basicity of an aqueous solution.
Hydrogen Ion (H+): A positively charged ion consisting solely of a proton, often involved in acidic reactions.