Qualitative Analysis - Result Question 60

####63. Gradual addition of KI solution of Bi(NO3)3 solution initially produces a dark brown precipitate which dissolves in excess of KI to give a clear yellow solution. Write chemical equations for the above reactions.

(1996, 2M)

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Solution:

  1. On addition of KI solution to a Bi(NO3)3 solution, firstly a dark brown precipitate of BiI3 is formed that dissolve in excess of KI forming a clear yellow solution of BiI4:

Bi3++3IBiI3 Dark   brown IBiI4 Clear yellow   solution 



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