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Find the effect of changing the concentration and the rate of reaction between Sodium Thiosulphate solution and Hydrochloric acid.

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Chemistry Investigation An Investigation to find the effect of changing the concentration and the rate of reaction between Sodium Thiosulphate solution and Hydrochloric acid. Aim: The aim of this investigation is to determine the effect of changing the concentration sodium thiosulphate on the rate of reaction between Sodium thiosulphate solution and hydrochloric acid. Scientific Knowledge: Reactions can go at all sorts of rates and one of the slowest rates of reactions is rusting of iron. One of the fastest rates of reactions is an explosion when the rate is a fraction of a second. In our lives, we occasionally want to alter the rate of reaction. When we put milk into the refrigerator, we are slowing down the rate at which the milk turns sour. Industrial chemists want to speed up reactions to lower costs and environmental chemists want to slow down reactions that can damage the earth. The rate of reaction is the rate of loss of a reactant or rate of formation of a product during a chemical reaction. Many factors can affect the rate of reaction. The important ones are as follows: * Temperature. * Pressure. * Concentration. * Light. * Surface Area. * Catalysts. It is a known fact that most reactions go faster at a higher temperature. This is due to the fact that, the reacting particles have more energy and move faster. ...read more.


The safety aspects that I am going to consider to make my experiment are as follows: * All long hair must be tied back so that it does not get caught on anything or so that it is not in the way of carrying out the experiment.. * All loose clothing such as ties should be kept secure by lab coats so that it is not in the way or so that the does not get caught on anything. * When pouring the sodium thiosulphate into the measuring beaker it must not spill anywhere on the workbench or on anyone. * The hydrochloric acid should not be spilled on anyone and should be washed off immediately with water if it comes into contact with anyone. So it must be kept away from the edge of the table to ensure that it does not fall off of the edge. * The acid must be kept away from the edge of the table so that it does not drop and spill on the floor. * When we do this experiment, it may be necessary to wear safety goggles, as things are very unpredictable, and even though it is very unlikely that the solution would come out of the conical flask during the experiment, one must still be cautious of spills. Variables: The variables for this experiment are as follows: * The independent variables are the concentration of the sodium thiosulphate and the amount water. ...read more.


A burette is a tube which is usually made out of glass and has a tap at the end of it with graduation marks along the side. They are used to measure volumes of liquids for example, during titrations. Burettes should be used at the temperature that is marked on their sides when using them with alcohol or organic mixtures. But if I had used a burette to measure out the sodium thiosulphate and the hydrochloric acid concentrations then, they would have been measured properly. When the temperature is being varied a water bath will be used to heat up the sodium thiosulphate and the hydrochloric acid to the necessary temperature. By doing this then the results would have been accurate and there probably would not have been many anomalies. In my plan I wrote that I was going to carry out the experiment five times to enable me to get accurate results. But I was only able to carry out the experiment four times as I ran out of the sodium thiosulphate. But I still got quite accurate results and they proved that my prediction was correct. Evaluation: Overall, the experiment went as planned and I followed the correct method to get the best results that I could get. But to get better results I should have used a burette to measure out the sodium thiosulphate and hydrochloric acid concentration to get the correct measurement just in case I used less or too much concentration. This could have also altered my results. ...read more.

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