RP 3

• Investigate how the rate of reaction varies with temperature

  1. Set a water bath to 20OC

  2. Accurately measure out 20cm3 of 1.0 mol dm-3 hydrochloric acid and pour into a conical flask

  3. Allow the solution of hydrochloric acid to reach the temperature of the water bath

  4. Accurately weigh out 1.0g of magnesium ribbon

  5. Place the magnesium into the conical flask, immediately attaching the gas syringe and starting a timer

  6. Record the volume of gas evolved in the first 20 seconds

  7. Repeat steps 1 – 6 for a range of temperatures (30OC – 60OC)
• If the temperature is too high, water starts to evaporate form the solution of HCl, this increases concentration of the solution which is supposed to be a controlled variable.
• Graph 


  8. Plot a graph of temperature (x-axis) versus initial rate (cm3/20s) (y-axis)