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An investigation into the affect of concentration on rate of a chemical reaction.

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Kedisha Scott Science Coursework An investigation into the affect of concentration on rate of a chemical reaction. I am going to investigate into the affect of concentration on the rate of a chemical reaction. The chemical formula for this experiment is: NA2 S2 O3 + 2HCL 2NaCL + H2O + SO + S. My prediction when you mix the Hydrochloric Acid with the Sodium Thiosulphate it will turn milky or a different colour, to produce a gas. This could be because the sulphur is precipitated. I think this might happen because a reaction rate depends on concentration. In solution of higher concentration and in gases at higher pressure, particles are closer together. They have greater chance of colliding, because there are more collisions, the reaction rate is greater. Low concentration High concentration The diagrams shows that if the concentration of the sodium Thiosulphate Solution is low then there are only a few collisions between particles. ...read more.


* Fourth, watch carefully to see the mixture turn cloudy and for the cross to disappear. * Fifth, when the cross has disappeared completely, stop the clock and record the results in your table. These are the steps that needs to be repeated: * First, to change the concentration of the Sodium Thiosulphate by adding enough distilled water so they both add up to 50cm. * Second, timing the rate of the reaction and recording it in the table. Observation I will need to record the amount of distilled water used, the amount of Sodium Thiosulphate, the time it took for the cross to disappear and the amount of Hydrochloric Acid used each time. To get accurate results, I need to be close to the experiment in order to read the time on the stop clock. The table below is the table that I used to record my results: Volume of sodium Thiosulphate [cm] Volume of distilled water [cm] Volume of hydrochloric acid [cm] Time taken for cross to be obscured [s] Results 1. ...read more.


Evaluation The experiment turned out well because we got accurate results that we could rely on, as being true. The results were accurate because we used the same equipments to do all the experiment. This makes it accurate because we used the same stop clock which meant that we didn't get any result that didn't fit the pattern of the experiment. The method we used gave results that were reliable because they all fitted in the pattern. We repeated the experiment twice and the results continued to fit the same pattern. We had a range of results to draw a conclusion. We used five solutions and repeated our experiment 2 times. This got us accurate results because we also found the average of the set of results that we collected from our experiment. Another way that we could have done our experiment was to use a different solution and compare the two set of results to see which one gives a more accurate result. ...read more.

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