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Cation Logic Tree                     Potassium, Zinc (II), Copper (II), Cobalt (II)?       Potassium NO Does a precipitate form with NaOH? YES Zn (II), Cu (II), Co (II)     Lilac flame? Yes! Zn (II) NO Mixed with NH4OH, does the liquid change color? YES Cu (II), Co (II)     Blue/green flame? Yes! Co (II) YES Does the color change to brown-orange? NO       Green/blue flame with many sparks and blue tip? Yes! Cu (II)         Green flame? Yes!