Metal cations with a high charge density act as these when coordinating ligands.
When these substances are added to water, compounds named for Zundel and Eigen, among others, are produced. The effect of these substances on water is spread through the entire solution by the Grotthuss mechanism. Antimony complexes form many of the "super-" variety of these; this "super-" class is defined by a certain position on the Hammett scale. Metal cations with a high charge density act as these when coordinating ligands. Their strength is most commonly measured by Ka (K-A), the dissociation constant, They have, among others, Arrhenius, Brønsted-Lowry, and Lewis definitions. For 10 points, name these substances, which have low pH in contrast to bases.
When these substances are added to water, compounds named for Zundel and Eigen, among others, are produced.
acids