alleryStart learning →Aqueous CaCl2 and AgNO3 react to give solid AgCl. Which ions are the spectator ions?
ASilver and chloride ions
BCalcium and chloride ions
CCalcium and nitrate ions
DSilver and nitrate ions
Answer & Solution
Correct answer: C. Calcium and nitrate ions
1. Write the complete ionic equation: Ca2+, Cl-, Ag+ and NO3- on the left.
2. On the right there are Ca2+, NO3- and solid AgCl.
3. Ca2+ and NO3- appear in identical form on both sides, so neither is changed.
4. Those unchanged ions are the spectator ions.
5. Silver and chloride are not spectators, because they combine to form the solid.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.1 Writing and Balancing Chemical Equations_
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