Conditions for Determining Ion Coexistence
Conditions under which ions cannot coexist in large amounts: 1. Formation of insoluble or slightly soluble substances (e.g., Ba²⁺ and SO₄²⁻ ); 2. Formation of…
Syllabus path: Properties of Substances and Reactions › Ionic Reactions & Testing
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CSCA Chemistry Concept & Principle Guide
Concept, principle, and explanation
Conditions under which ions cannot coexist in large amounts: 1. Formation of insoluble or slightly soluble substances (e.g., Ba²⁺ and SO₄²⁻ ); 2. Formation of gases (e.g., H⁺ and CO₃²⁻ ); 3. Formation of weak electrolytes (e.g., H⁺ and OH⁻ forming H₂O ); 4. Occurrence of redox reactions (e.g., Fe³⁺ and I⁻ ).
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Ionic Reactions & Testing
Ionic Reactions & Testing 1. Core Concept: Writing Ionic Equations The essence of an ionic reaction is the reduction of ion concentration. In the CSCA exam, "Split or Keep" is the most frequent testing point for writing and judging ionic equations. The "Split or Keep" Rules 1. Wr…
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