Question
An unknown solution may contain one of the ions of the pair below. Devise a test which allows you to distinguish between the ions.
Cu2+(aq) and Co2+ (aq)
Cu2+(aq) and Co2+ (aq)
Answers
DrBob222
Add NH4SCN. Co(II) forms a tetrathiocyanate complex which is blue.
Cu(II) forma a black black ppt with KSCN
Cu(II) forma a black black ppt with KSCN