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I measured the effect of concentration on the rate of reaction. The reactants were Sodium thiosulphate and Hydrochloric acid.

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Introduction

Data Analysis - Chemistry Coursework The effect of concentration on the rate of reaction ANALYSIS: For my data analysis, I measured the effect of concentration on the rate of reaction. The reactants were Sodium thiosulphate and Hydrochloric acid. This reaction made the products sodium chloride, sulphur dioxide, sulphur and water. When an acid is added to sodium thiosulphate, a yellow, cloudy precipitate is formed. And, as the sodium thiosulphate becomes more and more diluted, the solution takes longer and longer to form. However, in order for the reaction to take place, the reactants must first collide with each other. The collision theory should take place with the minimum amount of energy; this is called the activation energy. Head on collisions contain more energy, if collisions have enough energy then the collision that took place is successful and therefore a reaction occurs, however this isn't the case with all collisions. The collisions happen regardless of whether both the particles are in the solution, or whether one is in the solution and the other is a solid. The chances of collision are higher when the concentration is higher. ...read more.

Middle

However, on some points the error bars are wider apart, which suggest that some results were more accurate than others. EVALUATION: Through the experiment, we took reading for 8 concentrations and rates of reactions. We did this to make the results more reliable, and to make ourselves more confident with the outcomes. We measure the time taken for the reaction to occur, by measuring how long the solution took to become a yellow, cloudy precipitate. As a result of this, sulphur is the product. In order for this to be measured, we placed the solution made up of Sodium thiosulphate and HCl, in a conical flask and out it over a piece of paper marked with a thick black cross. This was so that we could look over the conical flask and time with a stop watch how long it took before the cross was no longer visible through the flask after the hydrochloric acid was added in. The equipment that was used for the experiment was; a stopwatch, a conical flask for the solution, marked piece of paper, 2 measuring cylinders for both reactants )1-ml and 50ml) ...read more.

Conclusion

The information/results that can be interpreted from this graph are not perfect as the line of best fit does not go through all the points. Also, the most accurate result, which was the concentration of 0.09, goes through this line of best fit. The result of 0.09 was the same in both experiments which shows it has great accuracy, unlike some of the other results - outliers. The result that was an outcome of the concentration 0.12 has the biggest error bar, meaning that the measurement is less reliable. To improve this for next time, I would possibly re-do this particular measurement experiment, to ensure that results make sense and are more accurate. Overall, considering all the points made about the experiment, I am happy with my results and I have confidence in using them. The conclusion that I have come to, which was the prediction of this experiment, was that the higher the concentration of sodium thiosulphate, the faster the rate of reaction occurs. Although there could have been small changed made to how the experiment was carried out, i.e. The equipment that was used, it still produced good, reliable and more or less accurate results which is the main point. ?? ?? ?? ?? Anisa Shah ...read more.

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The brief nature of this report will limit the grade. The elements of the investigation that are addressed are done well. There are numerous suggestions made throughout to improve this.

Marked by teacher Cornelia Bruce 17/04/2013

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