During the qualitative testing of , the addition of potassium iodide () dropwise produces a black precipitate. What chemical change occurs when an excess of is continuously added to this black precipi

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?

Prashant Kotian · Accepted Answer

Correct answer: C. When is added to , it initially forms a black precipitate of bismuth(III) iodide (). Upon the addition of excess , this black precipitate dissolves to form the tetraiodobismuthate(III) complex ion, , which gives the solution a characteristic orange color.

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