Why does the solution turn red, yellow and green? Here is a quick demonstration!
What is in the solution?
- Sodium hydroxide – makes the solution basic
- Glucose – acts as a reducing agent (loses electron)
- Indigo carmine – indicator for the reaction
What is happening?
- Indigo carmine can exist in oxidised (loss of electron ), reduced (gain of electron) and intermediate forms.
- Each form has a slightly different structure which means that each structure absorbs a different frequency of light; hence the three different colours – red, yellow and green.