@[email protected] with cations as @[email protected] The term @[email protected] @[email protected] may be used in the case of solid organic polymers. The acid form of a @[email protected] exchanger is the ionic form of a @[email protected] exchanger in which @[email protected] are hydrogen ions (H-form) or the @[email protected] have added a @[email protected] forming an undissociated acid.