Edexcel IAL Chemistry A2 16.17 Core Practicals 13a and 13b redox titrations
Edexcel IAL Chemistry A2 16.17 Core Practicals 13a and 13b redox titrations
Use the practical evidence carefully: know when to add starch, why sulfuric acid is used and how manganate(VII) or iodine-thiosulfate endpoints appear.
How this is tested
- State endpoint colours for manganate(VII) and iodine-thiosulfate titrations.
- Explain why sulfuric acid is used and why HCl or nitric acid is unsuitable.
- Add starch near the pale-yellow iodine endpoint to avoid a difficult endpoint.