A :B :C :D :E :F :G :H :I :J :K :L :M :N :O :P :Q :R :S :T :U :V :W :X :Y :Z :

Exchange Sites

Locations on each bead of ion exchange resin which hold mobile ions that are available for exchange with other ions in the solution that passes through the resin bed. In cation water softening, for example, mobile sodium ions located at the various exchange sites are exchanged for calcium, magnesium, iron, or other polyvalvent cations in the water being softened. Exchange sites are also called functional groups.