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# I have to produce a piece of work investigating rates of reaction between hydrochloric acid and sodium thiosulphate and the effect changes of concentration have on them.

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Introduction

REACTION Investigation of concentration and Aim I have to produce a piece of work investigating rates of reaction between hydrochloric acid and sodium thiosulphate and the effect changes of concentration have on them. Background Information I already know that the higher the concentration of something, the faster it will react. I know this from previous experiments and from looking in books. If the concentration of a solution is increased, there are more active particles per ml cubed. This increases the probability of active particles bumping into each other which is how the reaction is started. There are four factors which affect the rate of reaction: catalysts, temperature, concentration and surface area. I think concentration will be the most practical to do because it is easy to measure and it is not greatly effected by the room temperature. ...read more.

Middle

The amount of hydrochloric acid The concentration of the hydrochloric acid The person who looks at the cross (people have different ability of eye sight so we may get inaccurate results if we change the person looking at the cross.) The position of the beaker in relation to the cross underneath Things I will change are: The concentration of the sodium thiosulphate. You can see from this that I am going to make it a fair test because I am only changing one factor. Method * I will first set up all the apparatus (listed above) * I will then measure out: 10ml of hydrochloric acid and 50ml of sodium thiosulphate * I will then get the measures of the two substances (in separate containers) and pour them, at the same time, into a beaker with the X under it. ...read more.

Conclusion

Preliminary Results Volume of sodium thiosulphate(ml) water (ml) Hydrochloric acid (ml) Time it takes for X to vanish 50 0 10 49.18 secs 40 10 10 58.53 secs 30 20 10 1 min 25.12secs 20 30 10 2min 46.76secs 10 40 10 3min 57.03secs Diagram Prediction On the basis of my preliminary results, I am going to predict that as the concentration of sodium thiosulphate goes down, the time it takes for the X to vanish will go up. Conclusion I think that my prediction was right. This happens because when the concentration of something is lowered the particles of the two substances combine and there are less of the sodium thiosulphate particles. This makes it less likely that the hydrochloric acid particles will react with the sodium thiosulphate particles. Evaluation This experiment worked quite well. I think this because my recordings were not that far off each other and there were no wildly different results. ...read more.

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