Transition Metals & Reactions of Aqueous Ions | A‑Level Chemistry Exam Question Walkthrough

This video is a full A‑Level Chemistry exam‑question walkthrough on Transition Metals and the Reactions of Aqueous Ions, taking you through ligand substitution, complex‑ion chemistry, catalysis and aqueous‑ion reactions exactly the way examiners expect. You can also download the full exam question using the link below. https://drive.google.com/file/d/1OKQf58St5VidIx5xYzhsVgVBzvyKl1n7/view?usp=sharing Links directory for all YouTube videos: https://drive.google.com/file/d/1s3I5prjbJRR1U1lcKpXO9TQpQMaVoP66/view?usp=drive_link This walkthrough shows the exam‑marking points in purple, and the thinking‑out‑loud development and annotations in red/purple, so you can clearly see what earns marks and what helps you understand the logic behind the chemistry. What this walkthrough covers (no spoilers) Ligand substitution and drawing complex ions The chelate effect and why multidentate ligands increase stability Transition metals as catalysts (including Fe²⁺ catalysis) Concentration–time graphs linked to catalytic behaviour Reactions of aqueous complex ions with NH₃ Reactions of aqueous complex ions with Na₂CO₃ Long‑answer reasoning with clear, examiner‑friendly steps Timestamps 00:00 Introduction 00:05 How to use the walkthrough 00:49 Ligand substitution, drawing complex ions & the chelate effect 05:21 Transition metals as catalysts, concentration–time graphs & Fe²⁺ catalysis 12:24 Aqueous complex ions reacting with NH₃ and with Na₂CO₃ Perfect for AQA Paper 2, Paper 3, OCR A, OCR B (Salters), and anyone revising transition‑metal chemistry and aqueous‑ion reactions.