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An investigation into the effect of concentration on the rate of reaction between Sodium thiosulphate and Hydrochloric acid

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Introduction

An investigation into the effect of concentration on the rate of reaction between Sodium thiosulphate and Hydrochloric acid When sodium thiosulphate solution reacts with hydrochloric acid, the following reaction takes place: Sodium thiosulphate + hydrochloric ? sodium chloride + sulphur + water + sulphur solution acid solution dioxide A kind of yellow precipitate of sulphur will be formed. We will have to find out how long it takes to cover the whole cross by that mixture after it turns cloudy. Planning: Aim: I am going to do an investigation to find out the rate of reaction when using different concentration of sodium thiosulphate mixing with some hydrochloric acid to see the reaction of them. Prediction: I predict that as we increase the concentration of sodium thiosulphate solution, it would increase the rate of reaction. In another words, it would speed up the reaction. The reaction would take place faster, which means the time it takes to cover the whole cross on a piece of paper would be shorter. This does that due to the kinetic theory of particles because more particles of sodium thiosulphate are involved, therefore there is a higher percentage of successful collisions between the two chemicals resulting in the cross being obscured from view faster. ...read more.

Middle

Preliminary work: To help me plan my experiment, I decided to do some experiments before to get an idea of what was going to occur when carrying out my real experiments. Here is a table of the results I obtained in my preliminary work. Sodium thiosulphate in cm3 Water in cm3 Relative concentration of the hydrochloric acid (%) Time for the cross to disappear (s) Average (s) 36.83 25 0 100% 40.87 37.66 35.28 257.57 5 20 20% 268.18 270.22 284.91 Table of results Sodium thiosulphate in cm3 Water in cm3 Relative concentration of the hydrochloric acid in (%) Time for the cross to disappear (S) Average (S) Rate of reaction( /S) Rate of reaction in 1000 times 41.94s 25 0 100% 39.47s 41.23 0.024254184 24.254184 42.28s 44.20s 20 5 80% 46.5s 46.36 0.02157187 215.7187028 48.37s 76.89s 15 10 60% 72.78s 75.66 0.013217024 132.1702353 77.31s 126.67s 10 15 40% 125.68s 124.48 0.008033419 80.33419023 121.09s 282.69s 5 20 20% 278.19s 276.73 0.003613631 36.13630615 269.31s Results in bold I believe stand as anomalous results. After each experiment, the apparatus were washed out straight away so that the chemicals in the conical flask don't make the glass go misty, therefore this would affect the reaction time and make the results wrong as the experiment would take less time as the glass already is quite misty. ...read more.

Conclusion

weather can effect the temperature, it's either speed up or slow down the reaction, because heat gives the particles more kinetic energy, and opposite way, it gives less energy when temperature is low. So therefore doing the investigation on changing the temperature will be more of a fair test. Also, using the burette is not easy, its very hard to get everything to be the same amount, it can't be hundred percent accurate. And I tried my best to get it to be a fair test. Further work in this investigation would be to take a sample after 2 minutes from the mixture using a graduated pipette to put the sample into a cuvette. Then you would place the cuvette in a colorimeter and set it to see what percentage of light came out the other end through the mixture. You would do this for each experiment so you could get another table of results to plot some graphs to analyse and draw conclusions. After talking through the problems and the accuracy of things, if we were given more time, we could do more concentrations of sodium thiosulphate, or perhaps do the temperature, also shine a light through the mixture of chemicals, because that way we can see the cross more clearly, and through the liquid, and then it would extend the experiment. Gary Liu U5 - 1 - ...read more.

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