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

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The discussion centers on the formation of a blue solution and a white precipitate during a lab reaction involving Co(H2O)6^2+ and NH4SCN. Participants suggest that cobalt is more likely to form a complex with SCN than with NH4, leading to the question of whether the white precipitate is simply NH4. Clarification is provided that NH4 is actually the cation [NH4]+, and the resulting compound is [Co(NCS)4]2-. Further inquiry is made about the solubility of cobalt thiocyanate and the nature of the precipitate formed in the reaction. The conversation emphasizes the complexities of coordination chemistry and solubility in this context.
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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