2 x 1 hour lessons

This module explores the reactions of transition metal ions in aqueous solution, focusing on the visible colour changes and chemical processes involved. You'll investigate how these ions behave in ligand exchange, precipitation, and acid–base reactions.

You'll learn how different reagents — such as sodium hydroxide, ammonia, and chloride ions — affect aqueous metal ions like Fe²⁺, Fe³⁺, Cu²⁺, and Co²⁺. You’ll observe how changes in ligand type or coordination number influence the appearance and stability of the complexes.

By the end of this module, you’ll be able to:

• Describe and explain the characteristic reactions of aqueous transition metal ions

• Write ionic equations for precipitation and ligand exchange reactions

• Predict the colour changes associated with each reaction

• Explain the role of ligands and coordination number in complex stability

• Use observations to identify unknown metal ions in solution

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OCR (A) specification points covered: 5.3.1 Transition elements