Gradual addition of `KI` solution to `Bi(NO_3)_(3)` solution initially – InterviewSolution

InterviewSolution

1.	Gradual addition of `KI` solution to `Bi(NO_3)_(3)` solution initially produces a dark brown precipitate which dissolves in excess of `KI` to give a clear yellow solution. Write chemical equation for the above reactions.
Answer» `Bi(NO_3)_3` undergoes hydrolysis to form `HNO_3`. `Bi(NO_3)_3 + 3 H_2 O rarr Bi(OH)_3 + 3 HNO_3` `HNO_3` reacts will `KI` to liberate `I_2`, which dissolves in excess of `KI` giving clear yellow solution. `2HNO_3 rarr H_2 O + 2 NO_2 + [O]` `2 K I + 2HNO_3 + [O] rarr 2 KNO_3 + H_2 O + I_2` `I_2 + K I rarr K I_3`.

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