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.