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Rates of Reaction.

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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.


Concentration Levels As you know I will change the concentration of the mixture but I will make certain that there is 25ml of HCL acid and different amounts of Sodium Thiosulphate and Distilled Water So here I put in diagrams of how much is needed to be put and what concentration it is Method 1. Place the conical flask over the tile ensuring that you can see the cross clearly under the base. 2. Measure up your substances making certain that they are the correct measurements. To guarantee that they are crouch down placing your measuring cylinder on the table then eye level pour out the substance. 3. When all the substances have been measured up. Prepare to add in the substances in the order of : * Hydrochloric Acid * Then Sodium Thiosulphate * Finally(when using) distilled water 4. After putting in the HCL acid prepare your stopwatch and Sodium Thiosulphate as just when you put in the Sodium Thiosulphate you should start the timer. 5. Also if you are adding the distilled water add it at the same time with the Sodium Thiosulphate and start the timer as before making certain that you shake all the contents out. 6. Keep this going place your head above the conical flask making sure your safety goggles are on. See until you cannot see the cross anymore then stop the stopwatch. Be careful as a odour will be released 7. After the investigation go to the sink pour down the contents of the flask and fill with 250ml of cold water, then pour down sink. Repeat this 4 times. 8. ...read more.


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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