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To investigate the rate of the reaction between different concentrations of Hydrochloric acid and sodium thiosulphate

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Introduction

Rates of Reaction Coursework. Planning Aim: To investigate the rate of the reaction between different concentrations of Hydrochloric acid and sodium thiosulphate. Method: 1. Get a piece of card which has a black cross on it and place underneath a conical flask 2. Get three measuring cylinders. Using one, measure out the amount of Hydrochloric Acid and in the other measure out the Sodium thiosulphate, in the third measure out the amount of water. 3. Once the correct amounts are measured in the measuring cylinders, put the sodium thiosulphate and water into the conical flask. 4. Make sure the stopwatch is ready and at the same time pour the acid into the conical flask as well as starting the stopwatch. 5. The observer needs to watch the reaction and stop the stopwatch as soon as the black cross on the card is not viable. 6. The results need to be recorded. This method needs to be repeated for the following amounts of Hydrochloric Acid, Sodium thiosulphate and water. Experiment Hydrochloric Acid Sodium Thiosulphate Water (ml�) (ml�) (ml�) 1. 5 50 0 2. 5 40 10 3. 5 30 20 4. 5 20 30 5. 5 10 40 6. 5 0 50 To record my results, I plan to time how long it takes for the cross on the piece of card to disappear. ...read more.

Middle

I will place the measuring cylinders on a flat surface when measuring out the substance and carefully make sure that the meniscus lies on the measuring line. I will also use the same, conical flask for each experiment so that the solutions have the same area and volume to react in. The conical flask will also be rinsed and dried out for each experiment. I am going to observe the experiment throughout myself, because if other people observe it as well, then the results may become anomalous as the observation of two different people will not always be exactly the same. Preliminary Work For my preliminary work I decided which experiment would be the best to investigate. I had the option of: * Measuring the mass loss, as a gas is produced, using a balance. * Measuring the maximum volume of gas and the time at which the reaction stops using a gas syringe. * Measure how long it takes for a certain amount of sulphur precipitate to form, by observing the reaction through a conical flask until the cross from underneath isn't viewable. I decided not to measure the mass loss of gas produced because the experiment can become inaccurate if a low mass gas is produced, e.g. ...read more.

Conclusion

Evaluating My experiment was successful because I took great precautions when undertaking the experiment. I used accurate equipment, and observed the reaction throughout so that the results had been recorded under the conditions of the same observation. The method I used was suitable as it goes through the experiment systematically. Nevertheless, there is always room for improvements; such as I could have used a digital stopwatch to time the reaction as a digital stopwatch measures the time in seconds up to two digital places (0.00 seconds) This would automatically improve the accuracy of the results. I could also use another person to stop the stopwatch when the reaction comes to its end as a second could be added in stopping the stopwatch. Although there is room for minor adjustments, the results seem accurate and reliable because they follow the same pattern. Thus I believe they support my prediction and collusion as both show that the rate of reaction decreases as the concentration of Sodium Thiosulphate increases. Also they both show that the Sodium Thiosulphate reacts with the Hydrochloric Acid to form the reaction and produced the Sulphur precipitate, as when there was none present the reaction had no effect. The following reaction produces the Sulphur precipitate, Sodium + Hydrochloric Sodium + Water + Sulphur + Sulphur Thiosulphate Acid Chloride Dioxide Na S O (aq) + 2HCl (aq) 2NaCl (aq) + H O (l) + S (s) + SO (g) ...read more.

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