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Investigating the Rate of Reaction Between Sodium Thiosulphate and Hydrochloric Acid

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Introduction

Investigating the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid Aim: an experiment to find out how the rate of reaction changes with differing concentration of Sodium Thiosulphate (Na S O), Hydrochloric Acid (HCL) and water (H�O). Prediction : I predict that the rate of reaction will increase (and get more cloudy, more quickly) when the solution of Sodium Thiosulphate and Hydrochloric Acid are strongest, and there is no water. The reason for this is that it will be easier for the Sodium Thiosulphate to react with the Hydrochloric Acid, as they are the only two chemicals in the beaker, and there is not water to hinder the rate of the reaction. ...read more.

Middle

Equipment : Beakers, Measuring cylinders Blank piece of paper with a cross Stop watch Sodium Thiosulphate (Na S O) Hydrochloric Acid (HCL) Water (H�O). Method : * Collect equipment * Draw a cross on the blank piece of paper * Put flask on top of cross * Pour 30cm� of thiosulphate acid into the flask * Add 5cm� and start stop clock * Stop the stop clock when the cross disappears * Record the time * Repeat the points above but this time use: 25 cm� sodium thiosulphate and 5 cm� water 20 cm� sodium thiosulphate and 10 cm� water 15 cm� sodium thiosulphate and 15 cm� water 10 cm� sodium thiosulphate and 20 cm� water Results: Sodium Thiosulphate (cm3) ...read more.

Conclusion

105.35 102.32 0.005 10 20 0.3 5 180 181.08 183.50 181.82 0.005 Fair test: I made this experiment by doing the whole experiment in one day, meaning the room temperature was approximately the same. I took great care into pouring the solutions into the measuring cylinders and making sure that they were accurate, but instead of measuring cylinders I could have used a burette which would have gave me better results. Analysis / Conclusion : The results show that, as I had predicted, the more concentrated the solution was the quicker the reaction took place. As the concentration got weaker, the reaction was slower. I also believe if you were to swoop Sodium Thiosulphate and Hydrochloric Acid for two different chemicals the same would happen. ...read more.

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