During the qualitative testing of , the addition of potassium iodide () dropwise produces a black pr — Qualitative and Quantitative Analysis Chemistry Question
Question
During the qualitative testing of $Bi^{3+}$, the addition of potassium iodide ($KI$) dropwise produces a black precipitate. What chemical change occurs when an excess of $KI$ is continuously added to this black precipitate?
Answer: C
💡 Solution & Explanation
When $KI$ is added to $Bi^{3+}$, it initially forms a black precipitate of bismuth(III) iodide ($BiI_3$). Upon the addition of excess $KI$, this black precipitate dissolves to form the tetraiodobismuthate(III) complex ion, $[BiI_4]^-$, which gives the solution a characteristic orange color.
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