Final answer:
When calcium acetate is mixed with potassium sulfide in aqueous solution, no reaction occurs as all potential products are soluble. The balanced complete ionic equation shows that all the ions remain unchanged in the solution, leading to the response 'NR' for no reaction.
Step-by-step explanation:
When calcium acetate is mixed with potassium sulfide in aqueous solution, we are dealing with a double displacement reaction. Calcium acetate (Ca(C2H3O2)2) and potassium sulfide (K2S) would exchange their respective cations and anions. However, all of the possible products of this exchange are soluble in water, so no precipitate would form, and no chemical reaction would be observed. Therefore, the balanced complete ionic equation would show all the species simply as they are in solution, indicating that essentially no reaction has taken place:
2CH3COO-(aq) + Ca2+(aq) + 2K+(aq) + S2-(aq) → 2CH3COO-(aq) + Ca2+(aq) + 2K+(aq) + S2-(aq)
As this reaction shows no change on either side of the equation, the response for a reaction when calcium acetate and potassium sulfide are mixed in an aqueous solution is simply NR (no reaction).