OCR GCSE Biology B · J257
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: TechniquesWarm the solutions in a water bath at a chosen temperature, then mix the reactants and start a stopwatch. At regular intervals, transfer a small fresh sample to a separate drop of iodine on a spotting tile. Record when a sample no longer turns the iodine blue-black.
- Revise: Techniques
A container of water used to warm a sample gently and more evenly than a direct flame.