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Inorganic Chemistry help

  1. Apr 14, 2014 #1


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    1. The problem statement, all variables and given/known data
    A solution consist of Co+2 and Ni+2 ion in which excess KCN is added and in the resulting solution alkaline Br2 was added. The solution finally consist of which species?

    3. The attempt at a solution

    I guess some complex would be formed but how to exactly find out the complex? I don't have any idea as this does not involve any equations or mathematical approach. Any ideas?
  2. jcsd
  3. Apr 15, 2014 #2
    Are there any options with the problem?

    As you noticed, a complex should form in both the cases, the metal in the complex bears the same oxidation state as before.

    Addition of alkaline ##Br_2## (which is basically ##OBr^{-}##) serves as a test to differentiate between the two complexes. ##Ni(OH)_3## precipitates but the cobalt stays in the complex form.
  4. Apr 15, 2014 #3


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    The answer is K3[Co(CN)6] and Ni2O3. Why Co+2 has been oxidised to Co+3 and how did Ni2O3 appear?
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