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

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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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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...