Vitamin C Makes Iodine Disappear
Dark color fades/disappears.
Teaching & key ideas
What you do: Add vitamin C solution dropwise.
What students see: Dark color fades/disappears.
Why it works: Vitamin C reduces iodine to colorless iodide.
Question to ask: Where did the color go if we didn't dilute it much?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Where did the color go if we didn't dilute it much?