Final answer:
A chemical reaction occurs when aqueous solutions of chromium(III) iodide and potassium carbonate are combined due to the insolubility of the formed product, chromium(III) carbonate, which precipitates out of the solution.
Step-by-step explanation:
When aqueous solutions of chromium(III) iodide and potassium carbonate are combined, a chemical reaction may occur if the products of the reaction are insoluble. The possible reaction would be a double displacement reaction, producing chromium(III) carbonate and potassium iodide. However, we must consult solubility rules to determine whether a precipitate will form. Since chromium(III) carbonate is insoluble in water, this reaction would result in the formation of a precipitate. The reaction can be compared to the reaction of silver nitrate with potassium dichromate, where silver dichromate, an insoluble compound, forms as a red solid. In general, it's important to recognize that simply mixing two solutions does not guarantee a reaction will occur; a reactant must be formed that is either a precipitate, a gas, or otherwise not stable in an aqueous environment.