What is percent ionization?

Question

anonymous · Answer

Percent ionization values indicate the concentration of ions formed when a weak acid reacts with water. The double arrow shows that, like other reversible reactions that can reach equilibrium, the ionization of a weak acid does not go to completion. Percent ionization expresses how much of the original reactants convert to products. Similarly, the equilibrium expression for a reversible reaction expresses the relative concentrations of products to reactants. Both methods express the extent of reaction. In this table, the HCN will have the smallest equilibrium constant because it forms the smallest percentage of products compared to the other acids.

anonymous · Answer

Because percent ionization values indicate the concentration of ions formed  - so that means HCN has weaker ions formed? Am I on the right track? lol