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Investigating the factors which affect the speed of the reaction between Hydrochloric acid and Sodium thiosulphate.

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Introduction

.Investigating the factors which affect the speed of the reaction between Hydrochloric acid and Sodium thiosulphate Science Theory A rate of a reaction is determined by how quickly the particles collide with each other. The number of particle effects the collisions and the speed that they are travelling so a high concentration of particles and a high temperature would cause a very fast reaction because there are more particles colliding and heat makes the particles move faster. Variables In my investigation I intend to vary the concentration of the hydrochloric acid. I shall measure the rate of reaction by timing how long it takes for the cross to not be visible. Prediction I think that the more concentrated of hydrochloric acid the faster the reaction will be. Scientific knowledge and understand behind the prediction I think the reaction speed will change in this way because there will be more acid particles to collide with the sodium thiosulphate particles so collisions will take place more and so the reaction is faster. ...read more.

Middle

Amount of Acid (cm�) Time for cross to disappear (seconds) 5 25.94 10 23.22 15 22.98 These results show that there isn't a huge difference in reaction time between the different amounts so it doesn't matter how much acid is used. I shall use 10cm� because it is easiest to dilute evenly. Plan First I shall set up my beaker of 50cm� of sodium thiosulphate. I shall measure the rate of reaction by timing how long it takes for a black cross to not be visible. I will use hydrochloric acid of the following strengths: 1. 2m=10cm� of acid 2. 1.6m=8cm� of acid + 2cm� of water 3. 1.2m=6cm� of acid + 4cm� of water 4. 0.8m=4cm� of acid + 6cm� of water 5. 0.4m=2cm� of acid + 8cm� of water In order to keep my results accurate and reliable I shall use the same amount of hydrochloric acid and sodium thiosulphate, I ...read more.

Conclusion

This agrees with my original prediction. Evaluation I tried to make my results acierate by keeping the temperature the same but the 1st measurements were taken a different time of day to the others so the room temperature is likely to have been different. I made sure the results were reliable by using the same instruments and judgements but there is always a margin of error when measuring things by eye as it takes time for the brain to recognise that the stopwatch needs to be stopped, to improve this electronic probe like a colorimeter. I think my results are accurate enough to draw a firm conclusion and they seem to run in an appropriate curve. Even though I have one anomalous point, which could be because my first readings were so different to the rest and thus affecting the average, to reduce this I would make sure that the temperature was the same. ...read more.

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