Investigating Yeast

  1. In this investigation you are going to find out about the optimum conditions for respiration in yeast.

Equipment

  • Electronic Balance
  • Spatula
  • 250 ml beaker
  • 100ml measuring cylinder
  • 4 water baths
  • Bread flour
  • Yeast mixture
  • Timer
  • Thermometer
  • Sugar

Method

  1. Put 25 g of flour into the beaker, add 1g of sugar.
  2. Add 25 ml of the yeast mixture. (1 sachet dried yeast in 200ml warm water)
  3. Mix to a runny dough.
  4. Pour the mixture into the measuring cylinder (try not to get it on the sides)
  5. Start the timer and record the volume every minute for 15 minutes.
  6. Repeat this at a variety of temperatures using the water baths.
  7. You can also investigate the effects of different masses of sugar.

 

Risk Assessment

Mop up spillages promptly to prevent slipping hazards. Take care if using water at higher temperatures.

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