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Rates of reaction between sodium thiosulphate and hydrochloric acid

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Tom - this is good, in that it's all there. But it's muddled - again, I don't think you've really gone away from it and then come back fresh, and read it through to see if it makes sense. There's no point submitting work until you have. My comments are in italics You need to explain the chemistry behind the theory - it will be in your textbook I imagine Rates of reaction between sodium thiosulphate and hydrochloric acid Aim The aim is to find the effect of different concentrations on reaction rate. We have to change the concentration of one solution. This last sentence doesn't make sense- so what? Why? why not scrap it altogether? Theory We know that in order for two substances to react, their particles must collide with each other with enough energy for the reaction to be successful. The energy is necessary because...(ie what happens to the particles when they collide with enough energy?). ...read more.


Prediction I predict that the reaction will go faster with a stronger solution. This is because there is more energy in the reaction. Explain the chemistry of there being more energy there when it is a stronger solution Trial work I am going to try to keep the chemicals before the reaction at room temperature. I am keeping the same concentration of thiosulphate but I will change the concentration of the acid by diluting it with water. I will keep the same volumes of each chemical. The amount of thiosulphate will stay at 20ml and the acid and water combined will stay at 50ml throughout the experiment. Apparatus Chemicals: * Hydrochloric acid - varied volume * Sodium thiosulphate - 20ml * Distilled water - varied volume Equipment: * 100ml conical flask * 3 * 50ml measuring cylinder * Stop clock * 3 * 250ml beakers * Black cross - for testing * Stopwatch * Safety goggles Method Get three 250ml beakers. ...read more.


This shows that when a chemical is diluted it [has less energy to react as fast.] it reacts more slowly. This is because... This is useful to know because for example, if you spilt acid onto a table you would now know to mix it with water so that the acid has less of a chance to react. And therefore damage the table. Conclusion During this experiment I have found out that when diluted, reactions work a lot slower because there is less energy in the particles. This means that once this has been found out reactions can be slowed down dramatically and by being able to do that we can prevent spillages of acid and other chemicals from affecting whatever they spill on. It also has implications for industry: for instance, there are times when reactions need to work fast as this saves time and therefore money. As we know that they react faster when more concentrated then technologists can design processes using the correct concentration of chemical for the process required. Tom Grigg 11PT 1 ...read more.

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