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

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SUMMARY

The formation of the [Co(H2O)6]2+ complex in solution results in a blue solution accompanied by a white precipitate, identified as ammonium ions (NH4+). The discussion confirms that cobalt preferentially forms a complex with thiocyanate (SCN) rather than with ammonium (NH4+). The precipitate is determined to be 4[NH4]+, while the cobalt complex is identified as [Co(NCS)4]2-. This indicates a clear interaction between cobalt and thiocyanate in the reaction.

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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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