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Practice & Assess

Qualitative Analysis

Systematically identify unknown cations and anions using chemical tests

Unknown Sample

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HKDSE Tip

Cation tests: $Excess NaOH(aq) and NH₃(aq) reactions are key for identifying cations.$
Excess NaOH(aq): $Pay attention to solubility differences for Zn²⁺ vs Al³⁺ in excess NaOH.$
Excess NH₃(aq): $Pay attention to Cu²⁺ vs Zn²⁺ in excess NH₃.$