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# Rates of Reaction.

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Introduction

Rates of Reaction Aim: In this investigation, I am going to find out how changing the concentration of a solution, which consists of Hydrochloric Acid, SodiumThiosulphate and Water, affects the time in which a reaction occurs. Using a tile with a cross on we will observe and record how long it will take for the solution to react and due to it's the cloudiness that will occur during the investigation we will see how long it takes for the solution to cover it up and record this then use a simple equation to find out how long it each mixtures rate of reaction is. Prediction & Background: We know if a reaction is taking place due to the fact that something is occurring within the mixture For example such reaction changes are * Colour change * Smell is diffused to its surroundings * Solution/mixture turns cloudy * Any gases released from the Solution/mixture in bubble form or if collected * Temperature changes- Exothermic where heat is given out e.g. burning a fuel Or Endothermic where heat is taken in e.g. photosynthesis * (A flame given off) * Neutralisation- where a salt is produced when a acid reacts with a substance * Displacement- when a more reactant metal takes the place of a lesser one I think that in this investigation that the more concentrated a Solution/mixture the faster the rate of reaction will take place. I know this because it is a known fact that if you dilute something the slower the reaction takes place that is why I believe that the most concentrated substance will react the most in the investigation. ...read more.

Middle

Conclusion

here you have to be quick in watching the cross go an when you are stopping the time 1 second can make a big difference 5. When getting your goggle try to get a clean one and before each go, clean your goggle of any steam and try to have two people keeping watch on the cross so they can clarify with each other if the cross is gone and if ones goggle steam up then the other can carry on 6. As I said in no.1 this you have to try your best to 1 clean your flask out and2 keep within your fair test rules 7. To make sure you don't mix up the measuring cylinder why not number them and label them to corresponding substances or just place each beside its substance to avoid confusion 8. This can only be rectified if the investigation is repeated but due to time limitations this is not quite possible 9. This again as I said can be resolved if you have 2 people who will agree with each other if the cross has gone Improvements to the Investigation Another way to repeat this test and to keep it accurate is when measuring use a weighing scale to get it spot on. And on the investigation I would use IT to help out. I'd get a laser to go through the conical flask to a hit a light sensor attached to a computer with a timer. When you add the distilled water and/or the sodium thiosulphate the timer starts when the solution turns cloudy the laser will no longer hit the light sensor therefore stopping the timer. So you have an accurate time. Jahedur Rahman Rates Of Reaction GCSE/GNVQ Coursework ...read more.

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