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Investigating the rates of reaction with temperature - Sodium Thiosulphate (Na2S2O3) & Hydrochloric Acid (2HCl).

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Introduction

Aim: Investigating the rates of reaction with temperature - Sodium Thiosulphate (Na2S2O3) & Hydrochloric Acid (2HCl). Method: I am going to do 5 tests & each test will be performed 3 times to get an average result. I will put 50ml of Sodium Thiosulphate, 40ml water & 10ml of Hydrochloric Acid separately in a water bath then leave it for 5 min's so they get to the right temperature. When at the right temperature, I will mix the Sodium Thiosulphate, water & Hydrochloric Acid together in a conical flask and then put the conical flask onto a piece of paper with an X on it and time how long it takes for the X to not become visible, as the reaction turns the mixture cloudy. On the first test I will use a 25 Degree mixture of Sodium Thiosulphate, water & Hydrochloric Acid. ...read more.

Middle

Therefore they will collide more often and with more energy. Particles with more energy are more likely to overcome the activation energy barrier to reaction and thus react successfully. If solutions of reacting particles are made more concentrated there are more particles per unit volume. Collisions between reacting particles are therefore more likely to occur. Test Number 25oC 35 oC 45 oC 55 oC 65 oC Test 1 (min) 1.00.96 0.40.59 0.19.74 0.06.34 0.03.03 Test2 (min) 1.17.56 0.43.25 0.18.71 0.08.69 0.01.09 Test3 (min) 1.19.70 0.48.42 0.18.76 0.09.88 0.03.23 Average (min) 1.12.74 0.44.24 0.19.07 0.08.30 0.02.45 Results Table: Safety Points: 1. Make sure all glassware is away from edge of table. 2. Put all coats, bags & stools away. 3. Make sure water bath doesn't get too hot. 4. Always wash hands when finish. 5. Take care of all the glassware. Conclusion: From these results we can clearly see a pattern emerging. ...read more.

Conclusion

This could have been caused by any number of things such as: Measuring- the actual measuring of the chemicals is difficult because of the meniscus of the liquid and the accurateness of the measuring cylinders. Also, the human eye causes errors such as this. The eye could also have made mistakes in judging whether or not the cross had actually completely disappeared If someone was watching the reaction and someone else was working the timer, errors could occur in their co-ordination. To further investigate this experiment, I could use a wider range of temperature. I used 25, 35, 45, 55 and 65 degrees celcius in my experimant and so I could use the mid points of these temperatures for more accuracy. I could also go up to 95 degrees to obtain more results but this probally would not affect my experiment as the results are quite hard to record at 65 degrees as the mixture reacts so quickly. ...read more.

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