Method:
Measure the Sodium thiosulphate and pour it into the beaker. Place the beaker into the water bath and wait until it reaches the temperature you are starting the experiment with. Measure the Hydrochloric acid and take the beaker out of the water bath. Pour the acid into the beaker. As soon as you do this, start the stopwatch. Record how long the reaction takes. Once the ‘X’ that is marked underneath the beaker is not visible, the reaction has been completed.
Repeat this for the temperatures 30◦c, 40◦c, 50◦c and 60◦c. Write down your results in a results table.
I will make this experiment a fair test by using the same measurement of chemicals in all the experiments. If I don’t do this, my results will not be accurate and they may or may not make a pattern in my readings. I expect the reaction to happen faster as the temperatures increase; as I know that the more heat given off creates more energy which makes the particles collide more frequently. Therefore making the reaction faster.
Results:
The above are results from my experiment. I have repeated my observations twice and plotted them on the graph. The 1st experiment is in red and the 2nd in purple.
Conclusion:
From doing this experiment I have learnt that as the temperature gets higher the reaction gets faster. I thought this would happen as I mentioned in my method, as lots of energy comes from the heat.
Collisions can only result in a reaction if the particles collide with enough energy to get the reaction started.
Only the particles in the green area will react when they collide. The others just don’t have enough energy and they bounce apart from each other. So to speed up the reaction you need to create more energy in the particles. For that we increase the temperature, which as we know creates more energy.
Evaluation:
I made my experiment as accurate as I could by trying my best to measure the acids precisely and doing things as carefully as I could. I think my plan has worked well but a few improvements could be made. One of those is working a little faster so that I have enough time to complete experiments within the whole 50-minute lesson. I tried my best to make my evidence good enough for my conclusion and I think I have reached that target.