In a complete ionic equation, spectator ions are:

In a complete ionic equation, spectator ions are:

• A. Ions that appear on both sides and cancel out.
• B. Ions that form the precipitate.
• C. Ions that participate in the reaction.
• D. Ions that are always present in the solvent.

Answer: (A)

In a complete ionic equation, spectator ions are the ions that appear on both sides of the equation and can be canceled, because they do not participate in the chemical change. They come from soluble salts and stay dissolved, not forming the precipitate, gas, or new solid that constitutes the reaction’s core change. Removing these ions gives the net ionic equation, which shows only the species that actually undergo transformation. For example, NaCl(aq) and AgNO3(aq) produce AgCl(s) and NaNO3(aq). The complete ionic form is Na+ + Cl- + Ag+ + NO3- → AgCl(s) + Na+ + NO3-. The Na+ and NO3- ions are spectators, so they cancel, leaving Ag+ + Cl- → AgCl(s).

In a complete ionic equation, spectator ions are the ions that appear on both sides of the equation and can be canceled, because they do not participate in the chemical change. They come from soluble salts and stay dissolved, not forming the precipitate, gas, or new solid that constitutes the reaction’s core change. Removing these ions gives the net ionic equation, which shows only the species that actually undergo transformation. For example, NaCl(aq) and AgNO3(aq) produce AgCl(s) and NaNO3(aq). The complete ionic form is Na+ + Cl- + Ag+ + NO3- → AgCl(s) + Na+ + NO3-. The Na+ and NO3- ions are spectators, so they cancel, leaving Ag+ + Cl- → AgCl(s).