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Investigate how changing the concentration of Hydrochloric acid affects the rate of reaction with Sodium Thiosulphate solution.

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Science Coursework Aim I aim to investigate how changing the concentration of Hydrochloric acid affects the rate of reaction with Sodium Thiosulphate solution. Sodium + Hydrochloric Sodium + Water + Sulphur + Sulphur Thiosulphate Acid Chloride Dioxide (aq) (aq) (aq) (l) (g) (s) The reaction makes the solution go a yellow cloudy colour and a gas is given off. Procedure To ensure that our results are precise accurate and reliable we are going to take more than one set of results down and we will do the test twice. If there appears to be a set of results that does not fit the pattern we will repeat the test that it occurred in. We will also make sure that the apparatus we are using gives an accurate measurement. Also, in order to keep it a fair test, we will keep all of the variables the same, except from one. ...read more.


We will wash out the beaker that is used for the experiment each time a measurement is taken. To perform this experiment I will be using a HB pencil to draw a cross, I will place it under the beaker. The cross disappears as the product of the experiment is cloudy. Using a stopwatch I will measure how long it takes for the mix to go cloudy and then record it in a table of results. Prediction I predict that as the concentration of the sodium thiosulphate gets stronger the time the cross takes to disappear will decrease. This is because the particles are moving much quicker and are more densely populated making the collisions more likely. When the concentration is at its weakest, the time for the cross to disappear is at its highest. This means as it gets stronger; the time it takes for the cross to disappear will be less. ...read more.


This proves that my prediction of " the higher the concentration, the less amount of time taken to go cloudy" is correct. George Ives Also, from my results I can see that the higher the temperature the quicker the reaction takes place. To find this out we had to do the tests again when the room was hotter. Evaluation I feel that the evidence we have to prove the theory, the hotter the room temperature and the more concentrated the acid is the faster the reaction will take place, is reliable as we did the test twice and the results were very similar. Also the conditions of the test were the same apart from the room temperature. Improvements I feel that if we were to do the experiment again we should take down more results by doing the test maybe four or five times rather than two. I think that this will back up our theory even more. We could do it again with a different range of room temperatures to give even more proof of our theory. ...read more.

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