Formation of [Co(H2O)6]2+ Complex and NH4SCN Precipitate in Solution

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Discussion Overview

The discussion revolves around the formation of the [Co(H2O)6]2+ complex and the resulting white precipitate observed in a laboratory reaction involving NH4SCN. Participants explore the interactions between cobalt, thiocyanate, and ammonium in solution, focusing on the nature of the precipitate formed.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes that the reaction produced a blue solution with a white precipitate, suggesting that cobalt may preferentially form a complex with SCN over NH4.
  • Another participant questions the identity of NH4, clarifying it as the cation [NH4]+.
  • A different participant proposes that the compound formed in the reaction is [Co(NCS)4]2-, raising a question about whether ammonium remains as 4[NH4]+ in the reaction's products.
  • One participant advises checking the solubility of cobalt thiocyanate, implying that solubility may play a role in understanding the precipitate.

Areas of Agreement / Disagreement

Participants express differing views on the identity of the precipitate and the behavior of ammonium in the reaction, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

There are unresolved questions regarding the specific identity of the precipitate and the role of ammonium in the reaction, as well as the solubility characteristics of the involved compounds.

shannon3
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Hi

When we did this reaction in lab the result was a blue solution with a white precipitate. I think that the Cobalt will be more likely to form a complex with SCN than NH4 as they are both intermediate donors/acceptors.

If that's the case, then is correct that the white precippitate formed is just NH4 ?

Thank you:smile:
 
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What is NH4?
 
NH4 is really [NH4]+ a cation...! So the compound formed is [Co(NCS)4]2-

Does the ammonium remain as 4[NH4]+ on the right hand side of the reaction? I can't see what could be the precipitate...
 

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