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▷ ▶ Cation Tree SelectSmart.com free Science & Nature flowcharts and decision trees.
Cation Logic Tree
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Potassium, Zinc (II), Copper (II), Cobalt (II)?
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Potassium
| NO
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Does a precipitate form with NaOH?
| YES
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Zn (II), Cu (II), Co (II)
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Lilac flame?
Yes!
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Zn (II)
| NO
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Mixed with NH4OH, does the liquid change color?
| YES
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Cu (II), Co (II)
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Blue/green flame?
Yes!
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Co (II)
| YES
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Does the color change to brown-orange?
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NO
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Green/blue flame with many sparks and blue tip?
Yes!
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Cu (II)
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Green flame?
Yes!
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