- In this investigation you are going to find out about the optimum conditions for respiration in yeast.
- Electronic Balance
- 250 ml beaker
- 100ml measuring cylinder
- 4 water baths
- Bread flour
- Yeast mixture
- Put 25 g of flour into the beaker, add 1g of sugar.
- Add 25 ml of the yeast mixture. (1 sachet dried yeast in 200ml warm water)
- Mix to a runny dough.
- Pour the mixture into the measuring cylinder (try not to get it on the sides)
- Start the timer and record the volume every minute for 15 minutes.
- Repeat this at a variety of temperatures using the water baths.
- You can also investigate the effects of different masses of sugar.
Mop up spillages promptly to prevent slipping hazards. Take care if using water at higher temperatures.