The Effect of Temperature on the Rate of Reaction Essay

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The effect of temperature on rates of reaction


The aim of this experiment is to find out if the reaction rate of sodium thiosulphate solution and hydrochloric acid will be affected by a temperature change.


I predict that as a result of increasing the temperature of the sodium thiosulphate, the rate of reaction will be faster. Because of the increase in temperature, the particles will gain more kinetic energy.
This will therefore cause them to move faster and produce more successful collisions, causing the rate to increase.


Na S O + 2HCl S + SO + 2NaCl + H O

Before carrying out the experiment, I must first of all begin the preliminary work. This part of the experiment will enable me to choose an appropriate
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I will also make sure the apparatus is thoroughly cleaned before repeating the experiment. The only thing I will be changing for each reaction will be the temperature.


Diluted 5/5 with water


For the experiment I will use:

* Sodium Thiosulphate solution
* Hydrochloric acid
* Water
* A test tube
* A beaker
* A hot plate
* A thermometer
* A stopwatch
* A glass bottle
* Ice

Preliminary work:

From my preliminary results graph, I could determine how I needed to change the scale and concentration of my experiment. Using 10cm of sodium thiosulphate, I quickly discovered that at 45 C the reaction was too fast to measure and so for my scale to reach above that, I needed to dilute the sodium thoisulphate. When I accordingly changed the concentration to 5cm distilled water and 5cm sodium thoisulphate. I noticed that I would be able to conduct the experiment until 50 C because at 55 C it was only just measurable and this may be a source of error if I wasn’t able to record the results in time.
After analysing the data from my preliminary work, I decided to add in an extra temperature of below room temperature at 10 C which would produce a more in depth experiment. I also cut out some temperatures where the time taken for the black cross to be obscured was similar to other temperatures. For example 35 C where there
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