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Investigating the effect of temperature on the rate of reaction of sodium thiosulphate and acid.

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Introduction

Chemistry Investigation Sodium Thiosulphate and Hydrochloric Acid Reaction Planning I will investigate the effect of temperature on the rate of reaction of sodium thiosulphate and acid. I will keep the acid and sodium thiosulphate concentration constant and vary the temperature. The maximum volume in total will be 60cm� cubed. The rate of reaction will be found by finding the time for a cross drawn on a piece of paper with a pencil and placed under a conical flask to disappear from sight when looked at from above. It disappears because the sulphur formed is a solid and forms a cloud of fine particles through which you cannot see. Simple Plan: * Add 30ml of water to a measuring cylinder * Add 20ml of Sodium Thiosulphate to the same cylinder * Heat (or cool) the solution to one of the desired temperatures (shown below) * Add 10ml of acid to a separate cylinder * Add the acid to a conical flask placed above a piece of paper with a cross on it * Mix the Sodium Thiosulphate with the acid and begin timing the experiment For safety I will need to wear protective goggles to shield my eyes from the chemicals. I will need to be careful when measuring the acid too as it is corrosive. I will put a mat on the table whilst I pour the chemicals so as not to damage the table. I will make my testing fair by making sure that the same person times all of my experiments. ...read more.

Middle

I will use a maximum of 60ml of volume. The ranges of measurements which I will take include the following concentrations of Acid and Sodium Thiosulphate: Sodium Thiosulphate (ml) Acid (ml) Water (ml) 50 10 10 40 10 20 30 10 30 20 10 40 10 10 50 To obtain the correct concentration of Sodium Thiosulphate, I will dilute the solution. So for example, I will add 30ml of water to the 20ml of Sodium Thiosulphate. I think that this range will give a reasonable measurement of results for me to analyse. This will be adequate enough to plot graphs. My quantitative prediction for this investigation is that for every 10 degrees temperature rise, the rate of reaction will double. This means the hotter my sodium thiosulphate, the faster the reaction will occur. Obtaining To perform my experiment, I will need the following equipment: - Sodium Thiosulphate Solution - Hydrochloric Acid - 1 Thermometer - 1 Beaker - 2 Measuring Cylinders - 1 Conical Flask - 1 Tripod - 1 Heatproof Mat - 1 Stopwatch - 1 Bunsen burner - X on a Piece of Paper - 1 Pair of Tongs - 1 Pair of Goggles - 1 Apron I will need a pair of safety goggles so I do not get any acid in my eyes. I will also need a pair of tongs so I don't burn my hands moving the conical flask, which is heated in very hot water, onto the paper with a cross on it. ...read more.

Conclusion

Evaluating Evidence My method was good enough to make a conclusion because I gathered a large enough range of results to make accurate observations from. I also studied another group's work to see if their results agreed with what I had measured. I believe that I had enough evidence because I had a large range of results which were similar to each other. Most of my measurements were accurate and fit in with my prediction and the rules of science (the hotter particles are, the faster they react). The only result which I believe to be out of place is the second groups average results. Though there is a slight dip at the 40�c measurement, it is not big enough to be considered out of place and therefore can be ignored. I believe them to be out of place because they were probably timed in-accurately. I have gathered enough evidence to support my firm conclusion that the hotter the Sodium Thiosulphate, the quicker the reaction. I wrote this for my prediction and all of the results from my group and the second groups experiments show this. To further improve my experiment and add additional conclusive data, I would test a larger range of temperatures. For example, test every 5�c instead of testing every 10�c to improve the accuracy of my results. This would extend my investigation. I would also test higher and lower temperatures (starting from 5�c to 95�c instead of 20�c to 60�c). This would give a larger range of data for me to analyse and draw a conclusion from. ...read more.

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