Investigating temperature


  • Measuring cylinder
  • Thermometer
  • 1M hydrochloric acid
  • Magnesium ribbon (2cm strips)
  • Small beaker (100ml)
  • Timer
  • Ice
  • Water bath



  1. Measure out 25ml of acid.
  2. Put it into the beaker and use an ice bath to cool it to 5oC.
  3. Add the magnesium and time how long it takes for all of the magnesium to react.
  4. Repeat this at 10, 15, 20, 25 and 30oC. Use a larger beaker of warm water to heat the acid.
  5. Remember to use fresh acid each time.
  6. You may want to repeat each reading twice to obtain mean values.

Risk Assessment

Hydrochloric acid is corrosive, it represents a serious hazard to your eyes, safety spectacles must be worn. This reaction is exothermic, it gives out heat energy, take particular care with hot acids.

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