<Table> <Tr> <Td> </Td> <Td> This article does not cite any sources . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (December 2009) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article does not cite any sources . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (December 2009) (Learn how and when to remove this template message) </Td> </Tr> <P> A spectator ion is an ion that exists as a reactant and a product in a chemical equation . A spectator ion can, therefore, be observed in the reaction of aqueous solutions of sodium carbonate and copper (II) sulfate but does not affect the equilibrium: </P> <Dl> <Dd> 2Na + CO + Cu + SO → 2Na + SO + CuCO </Dd> </Dl>

What is the spectator ion in a reaction
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