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Does temperature affect the rate of reaction between Sodium Thiosulphate and Hydrochloric acid?

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Introduction

Does temperature affect the rate of reaction between Sodium Thiosulphate and Hydrochloric acid? Introduction In this experiment, I am going to mix together Sodium Thiosulphate and Hydrochloric acid. The sodium Thiosulphate mixed with the acid should then turn cloudy while we time it until we cannot see the black line on the other side of the beaker. We are going to measure the amount of time it takes for the Sodium Thiosulphate and Hydrochloric acid. I am also going to do some preliminary work so that I can check that my experiment works and check for any errors in my work. To make sure that further experiments are fair, I will keep all the variables the same and just change the temperature of the Sodium Thiosulphate. Factors that could affect my experiment are: * The temperature of the Sodium Thiosulphate-whether the temperature is hot or cold it might affect the rate of reaction * The concentration of the acid-whether it is strong or weak * The equipment used such as the beaker because if we use the same one we know that the darkness of lightness of the line will be the same throughout the experiment. * The lighting in the room-could affect whether the solution turns cloudy and we don't see this * The starting of the timer-this could make our results in accurate because different people have different reaction speeds and one person might start the timer before or after the other person. ...read more.

Middle

The range of temperature for the Sodium thiosulphate will each have a difference of 10degrees, this is so that we can obtain accurate results. The preliminary results were finding out the range of temperatures to use. The volumes used for the Sodium Thiosulphate and the Hydrochloric acid stayed the same throughout both the preliminary and the actual results. The amount used for the Sodium Thiosulphate was 35ml and the amount for the Hydrochloric acid was 6ml.I did not change anything during the experiment except for the temperature of the Sodium Thiosulphate. Prediction I predict that the higher the temperature the quicker the time it takes the Sodium Thiosulphate and the Hydrochloric acid to turn cloudy when mixed. I think this will happen because of the collision theory. The rate of reaction depends on how hard the reacting particles collide with each other. Particles have to collide in order to react. More collisions increase the rate of reaction. Temperature increases the number of collisions because when the temperature is increased the particles will move quickly. If they move quicker they will have more collisions. Higher temperatures also increase the energy of the collisions, because it makes all the particles move faster. Increasing the temperature only causes faster collisions. So at a higher temperature there will be more particles colliding with enough energy to make the reactions happen. ...read more.

Conclusion

I found out that a reaction goes faster when the temperature is raised. When the temperature increases by 10oC, the rate approximately doubles. As we found with our results. Evaluation The rate of reaction has been changed with different temperatures. My conclusion stated that a reaction goes faster when the temperature is raised. If the temperature increases by 10oC the rate of reaction approximately doubles. Such as if the temperature were 35oC the time would be 0.23.91s and if the temperature was 45oC the time should be 0.22.78s.Some of my results were not accurate because I made an error when choosing my temperatures. Instead of using these temperatures 35,45,55,65,75 and 85, I should have used ones such as 33,46,57,68,71and 80.This is because once I get the Sodium Thiosulphate to a particular temperature it starts to fall so by the time I get the Sodium Thiosulphate and Hydrochloric acid mixed the temperature has gone down by a few degrees. Using my graph to see whether my results were accurate, I can see that from 65oC to 75oC one of my results has dramatically fallen from a few seconds and that might not make it accurate. The volumes could be measured more accurately by measuring the amounts and then weighing them to see whether they are equal. If I wanted to improve my experiment I would put the Sodium Thiosulphate into a water bath so that the temperature stayed the same or I could choose a better range of temperatures to investigate. I could also make both the Hydrochloric acid and the Sodium Thiosulphate the same temperature. ...read more.

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