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# Investigate the effect of changing the concentration on the rate of a reaction.

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Introduction

Aim: I am going to investigate the effect of changing the concentration on the rate of a reaction. The reaction I am going to investigate will be: Mg + 2HCl MgCl + H To follow the rate of this reaction I will measure the volume of the hydrogen produced every 10 seconds for 2 minutes using a gas syringe. Safety: I must wear safety goggles at all times in case harmful chemicals get into your eyes. I mustn't wonder or run around in the class. I must handle all equipment with care and Place equipment in the centre of the table so it doesn't fall off and break. Fair Test: To make this test fair I will change the concentration of the acid. I will keep the same surface area of Magnesium i.e. using a magnesium ribbon. I will also us the same length of magnesium (2cm). Temperatures must be kept the same using a water bath. ...read more.

Middle

This was done so that the equipment wouldn't drop on the floor. We then had to cut out the magnesium ribbon into smaller pieces measuring exactly 2cm. A ruler was used here to give us an accurate measurement. We had to place the 2cm ribbon into a test tube and using a measuring cylinder we had to measure 0.25ml of the hydrochloric acid. This was for the first test. After Measuring the acid we then had to pour it into the test tube with the ribbon inside and then time how long it took for it to disappear using a stop clock. The results are shown below: Concentration of Acid Time for reaction to reach completion (sec) Average (sec) Test 1 Test 2 Test 3 0.25 142 140 136 139.25 0.5 122 119 153 164 0.75 90 93 92 92.25 1 82 80 75 78.75 2 33 27 30 31.25 The graph that I have constructed by hand (overleaf) ...read more.

Conclusion

We had gone through planning the experiment so many times I could practically do it without looking at my plan. The results of my test were very accurate as I repeated each concentration three times which enabled the elimination of random values, which wouldn't help me in constructing my graph or the rest of my coursework. Whilst I was doing my experiment I straightaway knew how I could make improvements and more came when the test was over. I could've used a larger range of concentration to get more results and construct a more detailed graph to see any other abnormal values. I could've also used different types of acids to compare graphs and results. I could also of used a larger range of magnesium ribbon. In other words just increased the length of the ribbon. The method I used for this investigation was quick, simple and appropriate for getting the results. Working with 3 other people speeded up the process but I felt that if we did our experiment separately and compared results the outcome would've been more precise. Max Buadi 10D ...read more.

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