counterion

Also known as counter-ion

thumb|160px|right|Polystyrene sulfonate, a [[cation-exchange resin, is typically supplied with as the counterion.]]

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Image: Sodium saccharin.svg

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~5 min read

Article

5 sections

Contents

Interfacial chemistry
Solution chemistry
Electrochemistry
Counterion stability
References

thumb|160px|right|Polystyrene sulfonate, a [[cation-exchange resin, is typically supplied with as the counterion.]]

In chemistry, a counterion (sometimes written as "counter ion", pronounced as such) is the ion that accompanies an ionic species in order to maintain electric neutrality. In table salt (NaCl, also known as sodium chloride) the sodium ion (positively charged) is the counterion for the chloride ion (negatively charged) and vice versa.