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In this investigation we will be trying to find out whether the temperature of the reactants affects the final reaction. In this investigation we will be using Sodium Thiosulphate and Hydrochloric Acid

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Introduction

Rates Of Reaction Introduction: In this investigation we will be trying to find out whether the temperature of the reactants affects the final reaction. In this investigation we will be using Sodium Thiosulphate and Hydrochloric Acid. We will be testing to see how quickly the products of the reaction turn opaque. To establish the opacity we will place the conical flask on a big black "X" mark on a piece of paper. We will be timing (with a stopwatch) to see how long it takes after mixing the reactants until we cannot see the X mark on the paper. Aim: The primary and only aim of this experiment is to establish whether or not the temperature of the reactants in a reaction affects the speed of the reaction. Prediction: I predict that a reaction taken place with reactants at a higher temperature will result in a faster reaction. Hypothesis: This is because the molecules in the 2 reactants will react themselves but at a higher temperature they are moving around faster and harder so a reaction is more likely to happen. ...read more.

Middle

* The same piece of paper with the "X" mark will be used throughout the experiment. * The reactants should be in a constant concentration throughout the experiment; as a higher concentration will yield different results. * Timing should be initiated as soon as the entire measuring cylinders are emptied into the flask; this way we will only start the procedure as soon as the all the preliminary steps are completed; such as emptying all the contents of the beakers. * Ensure the flask/beaker are both free from contamination. This means that other substances are not present in the apparatus prior to the experiment. This way we will gain the purest results from the chemicals; not the results of the contaminants as well! * There should only be one person assigned the task of looking at the "X" mark on the paper and waiting to see if it has disappeared or not; this is because different person have different depths of perception. * Use an electrical means of timing. For this experiment a stopwatch will be used. ...read more.

Conclusion

If I was given more time then I would have repeated this experiment. If I had any anomalies sticking out then I would first repeat that section of the experiment then I would try and find out why it happened to further my learning. Despite my results were not as good as they could have been I think they were enough to show that temperature does indeed affect the rate of reaction. I can also carry out a further investigation to find out whether concentration effects the rate of reaction: Aim: To find out whether the concentration of the reactants affects the rate of reaction. Prediction: I am predicting that a reaction with a higher concentration of reactants will react much quicker compared to a reaction where there is a lower concentration of reactants. Hypothesis The concentration of the reactants determine how much of the particles are there to collide; hence making the reaction take place quicker. A higher concentration results in more particles moving around hence the probability of a successful reaction is much higher. High Concentration Low Concentration Method: ?? ?? ?? ?? 1 Kamran Ali 11.1 Rates Of Reaction 1 Kamran Ali 11.1 Rates Of Reaction ...read more.

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