Identifying Cations in Solution (HSC SSCE Chemistry): Flashcards

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Identifying Cations in Solution
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Cations

Positively charged ions

NH4+\text{NH}_4^+ as exception

Cation but not a metal ion

Why flame tests produce colors

Electrons excited then return to ground state, emit light

Ca2+\text{Ca}^{2+} flame color

Brick-red

Ba2+\text{Ba}^{2+} flame color

Pale green

Cations with no colored flame

Mg2+\text{Mg}^{2+} and Ag+\text{Ag}^+

Fe3+\text{Fe}^{3+} + OH−\text{OH}^- observation

Brown precipitate

Cu2+\text{Cu}^{2+} + excess NH3\text{NH}_3 result

Deep blue solution

Fe3+\text{Fe}^{3+} + SCN−\text{SCN}^- observation

Deep red (blood red) solution

Coordinate covalent bond

Both electrons come from the ligand

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