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# Rates of reaction.

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Introduction

Rates of Reaction Plan The Aim The aim is to see the rate of reaction between sodium thiosulphate and hydrochloric acid when the sodium thiosulphate is at different concentrations. (To see if concentration affects the rate of reaction) The Variables The possible input variables are the concentration of the thiosulphate, the concentration of the acid, the temperature, the volume of thiosulphate and the volume of Hydrochloric acid. The possible outcome variables are the time it takes for the reaction to occur/ for the solution to become cloudy. The input variable I have decided to change is the concentration of the thiosulphate and the outcome variable that I will observe is the time it takes for the reaction to occur. My control variables I will keep the same to make it a fair test are the concentration of hydrochloric acid, the temperature, the volume of thiosulphate, the volume of hydrochloric acid and the same cross. Prediction My prediction is 'The higher the concentration of the thiosulphate the quicker the reaction between it and the hydrochloric acid.' ...read more.

Middle

10. Then do 40 cm of thiosulphate and 10 cm of water, then 30 cm of thiosulphate and 20 cm of water, then 20 cm of thiosulphate and 30 cm of water and then last of all 10 cm of thiosulphate and 40 cm of water. 11. Repeat each experiment three times and record all the results in a table. 12. Try and get all the readings within 0.1 of each other or as close as you can get. Scientific Knowledge The more concentrated the thiosulphate the quicker the reaction between it and the hydrochloric acid. This is because there are more thiosulphate particles to react with the hydrochloric acid particles. The reaction will become slower as the concentration decreases, this is because there are less thiosulphate particles to react with the hydrochloric particles. The solution will become cloudy as the reaction occurs, this is because sulphur is produced. Key -Hydrochloric Acid -Sodium Thiosulphate Low concentration High concentration These diagrams show that the more particles of thiosulphate there are, the more chance of them bumping into and reacting with the hydrochloric acid particles. ...read more.

Conclusion

My prediction was 'The higher the concentration of the thiosulphate the quicker the reaction between it and the hydrochloric acid.' This prediction has been proved correct by my scientific knowledge and my results. My graph shows that I had one odd point when the concentration of sodium thiosulphate was 40 g/l. The reaction occurred quicker than it should have done so maybe the thiosulphate or hydrochloric acid was too warm. Evaluation I have completed my experiment fairly by using the same equipment each time, the piece of equipment I used to make the test fair was a burette. I made sure the meniscus was on the line every time I did the experiment which meant that I was using the same volume of hydrochloric acid each time. Also I used the same cross each time so it was fair. I had one odd point on my graph and that was at 40 g/l. I think that the reaction occurred too fast because maybe either solutions temperature was too warm. So next time I will take the temperature of each solution. I also have enough results to support my conclusion and prediction because I took 3 reading of each one. Faye Cooke 11s ...read more.

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