Na+(aq) + Cl-(aq) + Ag+(aq) + NO3-(aq) --> AgCl(s) + Na+(aq) + NO3-(aq)

In the equation above, which species are classified as spectator ions?
  1. Na+ alone
  2. NO3- alone
  3. Na+ and NO3-
  4. Ag+ alone
  5. Ag+ and Cl-
Explanation
Answer: Na+ and NO3-

Spectator ions exist as reactants and products, and they are not consumed in the course of a chemical reaction. Therefore, the spectator ions in this reaction are Na+ and NO3-.
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