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How does the concentration of acid affect the rate of a reaction?

Extracts from this document...

Introduction

How does the concentration of acid affect the rate of a reaction? Aim In this experiment I aim to find out the rate of reaction of magnesium in different concentrations of sulphuric acid. Diagram List Of Equipment Clamp Gas Syringe Magnesium Conical flask Sulphuric acid Stopwatch (1M) Method 1. Set-up equipment as in the diagram except keep the magnesium out of the acid. 2. Place the magnesium inside the conical flask and start the stopwatch at the same time. 3. Record the amount of gas produced every 5 seconds. 4. Repeat with 0.8M, 0.6M, 0.4M and 0.2M acid. Fair Testing * I must keep the amount of sulphuric acid I use the same because it might speed up the reaction * I must keep the length of the D-tube the same because the gas has to travel from one end to the other. * I must keep the temperature the same because I know from my research that increased temperature means a faster reactions because the particles move faster causing more effective collisions. * I must keep the length of the magnesium the same as if I have more there is a larger surface area, which will increase the rate of reaction. Resaerch From my past Experiments in class * Concentration should increase the rate of reaction because there are more acid particles, which means there will be more effectibve collisions. ...read more.

Middle

Average amount 5 12.00 16.00 10.00 9.33 10 20.00 24.00 16.00 20.00 15 26.00 30.00 24.00 26.66 20 32.00 36.00 30.00 32.66 25 36.00 38.00 34.00 36.00 30 37.00 38.00 34.00 36.33 35 38.00 38.00 34.00 36.66 40 38.00 38.00 34.00 36.66 45 38.00 38.00 34.00 36.66 50 38.00 38.00 34.00 36.66 55 38.00 38.00 34.00 36.66 60 38.00 38.00 34.00 36.66 65 38.00 38.00 34.00 36.66 70 38.00 38.00 34.00 36.66 75 38.00 38.00 34.00 36.66 80 38.00 38.00 34.00 36.66 85 38.00 38.00 34.00 36.66 90 38.00 38.00 34.00 36.66 Results 0.8 Molar Sulphuric Acid 3cm Magnesuim ribbon Time (s) Amount gas 1 (cm3) Amount gas 2 (cm3) Amount gas 3 (cm3) Average amount 5 10.00 10.00 10.00 10.00 10 16.00 15.00 16.00 15.66 15 22.00 19.50 22.00 21.66 20 27.00 24.00 26.00 25.66 25 32.00 25.00 31.00 29.33 30 35.00 28.00 34.00 32.33 35 36.00 32.00 37.00 35.00 40 36.00 34.00 37.00 35.66 45 36.00 36.00 37.00 36.33 50 36.00 36.00 37.00 36.33 55 36.00 36.00 37.00 36.33 60 36.00 36.00 37.00 36.33 65 36.00 36.00 37.00 36.33 70 36.00 36.00 37.00 36.33 75 36.00 36.00 37.00 36.33 80 36.00 36.00 37.00 36.33 85 36.00 36.00 37.00 36.33 90 36.00 36.00 37.00 36.33 Results 0.6 Molar Sulphuric Acid 3cm Magnesuim ribbon Time (s) ...read more.

Conclusion

Infact the amount ranged from 34cm3 to 53cm3 this is because when I cut the magnesium ther may have been small differences in the length. Another reason is that in one lesson I used very old magnesium that looked like it had half reacted and in another lesson I used new, shiny magnesium meaning that there would be less particles to react and produce gas so thee would be less gas. Also the gas syringe is not perfect and it takes quite a bit of gas to ove it so it moves in steps.another reason is for 0.2 molar acid I didn't use a gaas syringe as the experiment took so long I had to do 2 at the same time. The last reason is how far I pushed the bung into the top of the conical flask as this pushed air into the gas syringe.Bearing that in mind the results were all quite close to the average. If I was to do the experiment again I would note down the temperature of the acid before I put the magnesuim in as temperature is a different variable. I would also use only shiny magnesium and take care in measuring it. I would leave lots of time to do the experiment and measure the concentrations of acid more carefully. ?? ?? ?? ?? Rodger Read 10D ...read more.

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