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A capital K with a lowercase a subscript.
Also known as: Ka, Acidity constant, Acid ionisation constant
Ka measures how completely an acid gives up its proton, and it spans about twenty orders of magnitude — which is why chemists almost always quote its negative logarithm instead. The subscript is not decoration: Kb, Kw and Ksp are different constants with the same letter.
Denotes the equilibrium constant for the dissociation of an acid into its conjugate base and a proton.
Contexts: Laboratory
Ranges over roughly twenty orders of magnitude across common acids, which is why the logarithmic pKa is used in practice.
Contexts: Laboratory
Is one of a family distinguished only by subscript — Kb for bases, Kw for water, Ksp for solubility — all written with a capital K.
Contexts: Laboratory
A capital letter K with a small lowercase a set below and to the right.