The Na+ and SO2−4 ions are spectator ions since they remain unchanged on both sides of the equation. They simply "watch" the other ions react and does not participate in any reaction, hence the name.[1] They are present in total ionic equations to balance the charges of the ions. Whereas the Cu2+ and CO2−3 ions combine to form a precipitate of solid CuCO3. In reaction stoichiometry, spectator ions are removed from a complete ionic equation to form a net ionic equation. For the above example this yields:
So: 2 Na+(aq) + CO2−3(aq) + Cu2+(aq) + SO2−4(aq) → 2 Na+(aq) + SO2−4(aq) + CuCO3(s)(where x = spectator ion)
⇒ CO2−3(aq) + Cu2+(aq) → CuCO3(s)
Spectator ion concentration only affects the Debye length. In contrast, potential determining ions, whose concentrations affect surface potential (by surface chemical reactions) as well the Debye length.
Net ionic equationedit
A net ionic equation ignores the spectator ions that were part of the original equation.[1] So, the net ionic equation only shows the ions which reacted to produce a precipitate.[1] Therefore, the total ionic reaction is different from the net reaction.
spectator, spectator, that, exists, both, reactant, product, chemical, equation, aqueous, solution, example, reaction, aqueous, solutions, sodium, carbonate, copper, sulfate, cuco3, ions, spectator, ions, since, they, remain, unchanged, both, sides, equation, . A spectator ion is an ion that exists both as a reactant and a product in a chemical equation of an aqueous solution 1 For example in the reaction of aqueous solutions of sodium carbonate and copper II sulfate 2 Na aq CO2 3 aq Cu2 aq SO2 4 aq 2 Na aq SO2 4 aq CuCO3 s The Na and SO2 4 ions are spectator ions since they remain unchanged on both sides of the equation They simply watch the other ions react and does not participate in any reaction hence the name 1 They are present in total ionic equations to balance the charges of the ions Whereas the Cu2 and CO2 3 ions combine to form a precipitate of solid CuCO3 In reaction stoichiometry spectator ions are removed from a complete ionic equation to form a net ionic equation For the above example this yields So 2 Na aq CO2 3 aq Cu2 aq SO2 4 aq 2 Na aq SO2 4 aq CuCO3 s where x spectator ion CO2 3 aq Cu2 aq CuCO3 s Spectator ion concentration only affects the Debye length In contrast potential determining ions whose concentrations affect surface potential by surface chemical reactions as well the Debye length Net ionic equation editA net ionic equation ignores the spectator ions that were part of the original equation 1 So the net ionic equation only shows the ions which reacted to produce a precipitate 1 Therefore the total ionic reaction is different from the net reaction See also editCatalysisReferences edit a b c d Mustoe Frank May 22 2001 Chemistry 11 Textbook 1st ed McGraw Hill Ryerson School Chapter 9 1 ISBN 978 0070886810 nbsp This chemistry related article is a stub You can help Wikipedia by expanding it vte nbsp This chemical reaction article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Spectator ion amp oldid 1180584969, wikipedia, wiki, book, books, library,
