The Effect of Concentration on the Rate of a Reaction

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Heidie Park 11S (N)

Chemistry Investigation

The Effect of Concentration on the Rate of a Reaction

Aim

The aim is to investigate the effect of the concentration of the solution on the rate of reaction.

Apparatus needed

20cm length of magnesium ribbon

Emery paper

Dilute HCl acid (2M)

Distilled water
Stopwatch

Measuring cylinder

Test/Boiling tubes

Test tube rack

Planned method

  1. Gather and set up all apparatus.
  2. Clean the black magnesium oxide off the strip of magnesium with a piece of emery paper.
  3. Measure out 20ml of HCl solution for the first experiment, and pour into a test tube.
  4. Drop in the cleaned strip of magnesium ribbon, and start the timer simultaneously.
  5. Stop the timer when the magnesium has dissolved completely and there is no more fizzing.
  6. Record results into a clearly labeled table.
  7. Repeat steps 2-6, but using a lower concentration of solution each time.

Measurements

  •  Magnesium ribbon = 4cm each time
  •  HCl solution= 1. 20ml of 2M HCl

      2. 15ml of 2M HCl, 5ml of water

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      3. 10ml of 2M HCl, 10ml of water

      4. 5ml of 2M HCl, 15ml of water

      5. 20ml of water (this is the control)

Diagram

Results

These are the results we obtained for the experiment:

We also did another small experiment measuring the temperature rise during the reaction of the two chemicals.  They were taken when experiment 2 was carried out:

Graph

Conclusion

Looking at the results obtained from the two trials of the experiment, I can deduce ...

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