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# How the concentration of an acid affects the rate of reaction.

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Introduction

Chemistry coursework How the concentration of an acid affects the rate of reaction Prediction For a reaction to take place there must be enough energy for the particles to collide & react. So as the concentration increases so will the rate of reaction because there are more acid particles in the solution for the magnesium to collide & react with. Therefore I think the rate of reaction will speed up as the concentration gets higher, for instance 1M will react twice as fast as 0.5m. Plan I will set up the apparatus as shown in the diagram below. I will be reacting magnesium with sulphuric acid to test if the concentration of an acid affects the reaction time. I will use molars between 0M & 1M for my initial trial run. I will measure the rate of reaction using a conical cylinder with a rubber bung & a gas syringe. I will then time how long it takes to fill up to 100cc of gas. I will repeat each concentration 3 times then take a average so I get more accurate results, I will repeat any anomaly's I get so I will get my final results as accurate as possible. ...read more.

Middle

They did this in two ways: * They show us not to go in margins below 0.25M or else the results would be too slow. * We had initially planned to use 0.25g of magnesium ribbon in each test we did but found that a more suitable amount was 0.12g for the reason that each test would take too long. Results Experiment results Strength of concentration of sulphuric acid (molar) Time taken for 100cc of gas in seconds 1 2 3 Average 0.5 197.53 213.03 213.9 149.78 202.41 0.75 72.54 96.78 73.72 51.42 73.01 1 33.72 36.06 34.31 34.69 1.25 22.94 32.59 43.94 28.05 28.62 1.5 17 17 16 16.67 Rates of reactions Amount of sulphuric acid (cc) Average time Rate of reaction To 2 d.p 100 149.78 0.667645881 0.67 100 51.42 1.944768573 1.94 100 34.69 2.882675123 2.88 100 28.05 3.565062389 3.57 100 16.67 5.99880024 6.00 On the first table any anomalies were repeated. We used the experiment results average column to work out the rates of reaction table - we did this by taking the amount of acid used and dividing it by the average time for that reaction to occur- volume/time (100/time). ...read more.

Conclusion

My line of best fit was a smooth curve going through three of the five points; however I had two results that didn't quite fit - one above the line, one below. I think a reasonable explanation for this is that it was human error - such as placing the bung in the flask after different amounts of time or having to begin using a different coil of magnesium ribbon part way through the experiment. I could improve the accuracy of the results by using the sane coil of ribbon, having an electronic gas syringe that could collect gas as soon as the magnesium was added or doing more tests with more concentrations & repeat them more times- however the amount of tests I did with repeats does offer a reliable source of information. Another way in which I could improve this experiment is to do this test in a different way, I could measure the amount of gas formed every 10 seconds for a minute then take a average for each concentration to see how many CC's of gas were formed per 10 seconds, I could do that & see which test had the most reliable results with least anomaly's. ...read more.

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