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CSCA ChemistryChapter 2: Properties and Reactions of SubstancesIntermediate

Ionic Reactions & Testing Methods

离子反应方程式书写与常见离子检验方法 · Node 2.4

Net ionic equations, solubility rules, precipitation, and qualitative testing for Fe3+, Cl-, SO4(2-), and flame tests.

Chapter Weight: 30% of official examination
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Core Mathematical Axiom

Formula Proof & Traps
Ba2++SO42−​→BaSO4​↓,Ag++Cl−→AgCl↓,Fe3++3SCN−→Fe(SCN)3​(Blood Red)
CSCA Exam Trap Alert

Omitting acidification with dilute HCl prior to BaCl2 addition when testing for sulfate ions (SO4(2-)).

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