An insoluble solid, usually a polystyrene or a polysaccharide, with cation groups (e.g., NR3+ or NR2H+), which can attract and hold anions that pass by in a moving solution in exchange for anions previously held.
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An insoluble solid, usually a polystyrene or a polysaccharide, with cation groups (e.g., NR3+ or NR2H+), which can attract and hold anions that pass by in a moving solution in exchange for anions previously held.