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# An investigation into how the concentration of a substance effects the reaction time

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Introduction

An investigation into how the concentration of a substance effects the reaction time Introduction In this experiment I am trying to find what difference concentration makes to reaction times. I am using the two chemicals Sodium Thiosulphate and Hydrochloric Acid. I will dilute the substance with water to test what difference the concentration makes to the experiment. Aim To find out the difference that the concentration makes to the reaction time. I will carry out 2 experiments the same way making sure that I use the same measurements in each one. But the two experiments cannot be carried out exactly the same due to human error. Prediction I predict that if there are more units of the solution and less units of water, that the reaction will take place much quicker. ...read more.

Middle

3. Watch into the Conical flask and as soon as the 'X' can no longer be seen and stop the timer. Record your time. 4. Now repeat the experiment but instead of putting 20mm of each solution in the beaker use 15mm of each solution and make up the 10mm of solution with water. Use this step over and over decreasing the amount of solution each time (e.g. 10mm Hydrochloric acid and 10mm Sodium Thiosulphate. The last 20mm should be water). Results 1st Results Solution (mm) Water (mm) Time (sec) 40 0 13.28 30 10 19.47 20 20 35.13 10 30 1.29.88 5 35 5.28.16 2nd Results Solution (mm) Water (mm) Time (sec) 40 0 15.47 30 10 20.65 20 20 42.22 10 30 1.33.28 5 35 5.42.85 Graph can be found at the back of the project. ...read more.

Conclusion

Even though my prediction was pretty accurate on what would happen during the experiment, it wasn't perfect, mostly to human error on my part but one other thing I could of done better would to be more specific in my results by increasing the range. If I did the experiment again I would defiantly consider changing the above to try and get the most accurate results and graph I possibly could. The bigger the range I could get then the more accurate my graph could be, unfortunately I only used 5 results on my graph so I couldn't get a brilliant line. But the line I got was a very good fit and had no anomalous results in it. The experiment I carried out was a satisfactory one that could have been made better if I had used a bigger range. Harry Stephenson 10T 1 ...read more.

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