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Gradual addition of KI solution to Bi(NO...

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.

Text Solution

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`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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