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Sodium Thiosulphate 'Investigation'.

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Introduction

Sodium Thiosulphate 'Investigation' Aim In this experiment I will be investigating the different factors which will affect the rate of reaction between sodium thiosulphate and hydrochloric acid. Those factors are: 1) Temperature 2) Concentration of Acid 3) Catalysts I have chosen to do the experiment using different concentrations of acid, to discover how this can affect the length of time it takes for a reaction to occur. I will increase the concentration of hydrochloric acid each time, and see if the rate of reaction increases. I will time how long it takes for an 'X' placed under a conical flask of the solution to disappear using a stopwatch. Prediction I predict that the higher the concentration of hydrochloric acid the quicker the 'X' will disappear, e.g. 2.5 rather than 0.5. I think this because of the collision theory. In a weaker concentration of hydrochloric acid, such as 0.5, it is diluted so it consists of more water than acid. ...read more.

Middle

The equation for this reaction is: The reaction between hydrochloric acid and sodium thiosulphate is shown in the equation. The 'X' can be seen through the clear solution at the beginning of the experiment but not through the cloudy solution as the reaction takes place. As the reaction takes place the solution becomes cloudy and will slowly cover the 'X' drawn on the piece of paper. The experiment is conducted at different concentration of hydrochloric acid, and by measuring the time it takes for the 'X' to disappear, the rate of reaction can be found. Safety It is very important that I made this investigation safe, if we did not make it safe there could be very dangerous consequences, I made this investigation safe by wearing goggles to protect my eyes from any accidental splashes of chemicals. Also when the hydrochloric acid and sodium thiosulphate mix together, they give of an awful smell which could cause you to feel unwell so we did not always stand right next to the experiment so we could have fresh air. ...read more.

Conclusion

This is why it would have taken longer in the 0.5 concentration of hydrochloric acid, than the 2 concentration of hydrochloric acid. Evaluation The results in my investigation show that I was correct in my prediction, the higher the concentration of hydrochloric acid the quicker the reaction takes place, this also proves that the collision theory is correct, this is where if there is a higher concentration of hydrochloric acid then the sodium thiosulphate particles could collide with the hydrochloric acid particles quicker because there are less water particles, but with a weaker concentration there is more water so it would be harder for sodium thiosulphate particles to collide with the hydrochloric acid therefore make the reaction slower, there are no results that I have recorded which are totally out of place. I don't think that I could have done anything to improve my results for my sodium thiosulphate investigation, if I could then it would probably have been to try and get my amount of hydrochloric acid and sodium thiosulphate as accurate as possible so my results are more accurate, but I think I did it well enough already as there are no anomalies. ...read more.

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