Counterion
A counterion is an ion (a chemical compound with electrical charge) that is used to balance out the charge on a different ion in order to make a salt or solutio
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A counterion is an ion (a chemical compound with electrical charge) that is used to balance out the charge on a different ion in order to make a salt or solution. Counterions are needed because ions cannot exist on their own in liquid or solid form.
In sodium chloride, Na+ is the counterion of Cl−, and Cl− is the counterion of Na+.
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