Reactions of ions in aqueous solution (A-level only) (3.2.6) | AQA A-level Chemistry - (7405) | KnowledgeSet

Reactions of ions in aqueous solution (A-level only)

Chemistry · A-Level · AQA · AQA A-level Chemistry - (7405) · Specification point · 3.2.6 · Inorganic chemistry

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3.2.6 Reactions of ions in aqueous solution (A-level only)

The reactions of transition metal ions in aqueous solution provide a practical opportunity for students to show and to understand how transition metal ions can be identified by test-tube reactions in the laboratory.

Content	Opportunities for skills development
$In aqueous solution, the following metal-aqua ions are formed: [M(H₂O)₆]²⁺, limited to M = Fe and Cu [M(H₂O)₆]³⁺, limited to M = Al and Fe The acidity of [M(H₂O)₆]³⁺ is greater than that of [M(H₂O)₆]²⁺ Some metal hydroxides show amphoteric character by dissolving in both acids and bases (eg hydroxides of Al³⁺). Students should be able to: explain, in terms of the charge/size ratio of the metal ion, why the acidity of [M(H₂O)₆]³⁺ is greater than that of [M(H₂O)₆]²⁺ describe and explain the simple test-tube reactions of: M²⁺(aq) ions, limited to M = Fe and Cu, and of M³⁺(aq) ions, limited to M = Al and Fe, with the bases OH⁻, NH₃ and CO₃²⁻$	$AT d and K PS 1.2 Students could carry out test-tube reactions of metal-aqua ions with NaOH, NH₃ and Na₂CO₃ AT d and k$

Content

Opportunities for skills development

In aqueous solution, the following metal-aqua ions are formed: [M(H₂O)₆]²⁺, limited to M = Fe and Cu [M(H₂O)₆]³⁺, limited to M = Al and Fe The acidity of [M(H₂O)₆]³⁺ is greater than that of [M(H₂O)₆]²⁺ Some metal hydroxides show amphoteric character by dissolving in both acids and bases (eg hydroxides of Al³⁺). Students should be able to: explain, in terms of the charge/size ratio of the metal ion, why the acidity of [M(H₂O)₆]³⁺ is greater than that of [M(H₂O)₆]²⁺ describe and explain the simple test-tube reactions of: M²⁺(aq) ions, limited to M = Fe and Cu, and of M³⁺(aq) ions, limited to M = Al and Fe, with the bases OH⁻, NH₃ and CO₃²⁻

AT d and K PS 1.2 Students could carry out test-tube reactions of metal-aqua ions with NaOH, NH₃ and Na₂CO₃ AT d and k