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The rate of reaction of sodium thiosulphate and hydrochloric acid

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Introduction

Chemistry Coursework Problem How do we measure the rate of reaction of sodium thiosulphate and hydrochloric acid, and how does the rate of reaction change as the independent variable is changed. I have listed below some of the factors and variables, which I think, can affect the aforesaid problem above. 1 The temperature of the hydrochloric acid. 2 The concentration of the hydrochloric acid. Factors/Variables to be investigated. I have decided to choose how the temperature of the hydrochloric acid will affect its reaction rate with sodium thiosulphate. I decided to choose this because I think that our results would be more precise than if we were investigating the effect of concentration on the rate of reaction with sodium thiosulphate. This is because if we had chosen to do concentration, it would have been very difficult to make sure that we were measuring the correct volume of water to decrease the concentration of the acid. We would have had to have used precision equipment such as burettes, which would have been rather time consuming in the limited amount of time that we have allocated to us. Independent Variable I am going to investigate how the temperature of the hydrochloric acid will affect its rate of reaction with sodium thiosulphate. Dependant Variable I am going to measure the rate of reaction between sodium thiosulphate and hydrochloric acid.= it takes for the cross to disappear. ...read more.

Middle

We will not heat the acid any more than 70 because then it would start to boil, and become a safety hazard. We will also make sure that all bags and stools are safely under the tables to prevent anyone falling over them and hurting him or herself. We will also make sure to wipe up any spillages of acid with paper towels. Result Strategy To ensure that our results are reliable, we are going to repeat our experiment and continue testing each result remains the same. I have drawn below a replica of the table, which we will be using to record our results on. Temp of HCl ( ) Time ( ) Rate ( ) 20 30 40 50 60 As you can see from the above we have decided that the range of variation for our independent variable is between 20 and 60 . We have decided to move up in units of 10 . This is because it would be too time consuming to move up the scale in units of 5 . When we move up in units of 10 , it will give us a more accurate reflection of how the increase in temperature affects the reaction rate. I am going to put my results in graph form, so we can easily interpret what happens when the temperature increases. ...read more.

Conclusion

Evaluation If I were going to carry out this experiment again, I would make some improvements. 1. I would measure out the acid and sodium thiosulphate using a measuring burette instead of a measuring cylinder. 2. When heating the acid, I would use a thermostatically controlled water bath. 3. I would use distilled water to rinse out the conical flask. 4. I would use a more accurate stopwatch, one that measured in milliseconds. 5. I would use a data logger to record my results, like the one I have drawn below. This would give me a more accurate result. In doing this experiment, I encountered some minor problems. I discovered that once we had heated the acid to the desired temperature, the temperature continued to rise, going up by as much as 30 over the desired temperature. In order to counteract this, we had to place our conical flask containing the acid, under a tap after it was heated to cool it down quickly. We also had a problem in lifting the acid, which had been heated in the conical flask, unto the cross, without burning ourselves. In order to counteract this we used a pair of tongs to lift the hot conical flask. I have decided that if I were repeating this experiment again, I would raise the temperature by 5 intervals instead of 10 intervals. This would give me a more accurate result and a more true reflection of how the rate of the reaction is in proportion to the temperature. ...read more.

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