Complete the following electronic configurations.

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Complete the following electronic configurations - CIE - A-Level Chemistry - Question 2 - 2016 - Paper 1

Question 2

Complete the following electronic configurations. - the cobalt atom, Co 1s²2s²2p⁶ 3s²3p⁶ 3d⁷4s²: - the cobalt(II) ion, Co²⁺ 1s²2s²2p⁶ 3s²3p⁶ 3d⁷: State the colou... show full transcript

Worked Solution & Example Answer:Complete the following electronic configurations - CIE - A-Level Chemistry - Question 2 - 2016 - Paper 1

Step 1

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Answer

The cobalt atom, Co: $1s^22s^22p^63s^23p^63d^74s^2$
The cobalt(II) ion, Co²⁺: $1s^22s^22p^63s^23p^63d^7$

Step 2

State the colours you would observe when concentrated HCl(aq) is added to an aqueous solution of cobalt(II) nitrate, Co(NO₃)₂.

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Answer

When concentrated HCl(aq) is added to cobalt(II) nitrate, the solution initially appears pink due to the presence of the complex ion $[CoCl_4]^{2-}$ , which is blue in colour. The complexes formed are:

$[Co(H_2O)_6]^{2+}$ (pink)
$[CoCl_4]^{2-}$ (blue)

The geometry of $[Co(H_2O)_6]^{2+}$ is octahedral, while $[CoCl_4]^{2-}$ is tetrahedral.

Step 3

Draw diagrams showing the structure of Co(R₃P)₂I₂ and the two isomers of Ni(R₃P)₂I₂.

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Answer

The structure of $Co(R₃P)_2I_2$ is shown below:

   P   P
    \ /  
      Co
    /  \
   I    I

The isomers of $Ni(R₃P)_2I_2$ can be represented as follows:

Isomer 1:

   P   P
    \ /  
      Ni
    /  \
   I    I

Isomer 2:

  P
  | 
Ni
 / 
P 
|
I
I

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Complete the following electronic configurations - CIE - A-Level Chemistry - Question 2 - 2016 - Paper 1

Worked Solution & Example Answer:Complete the following electronic configurations - CIE - A-Level Chemistry - Question 2 - 2016 - Paper 1