- To make sure you get good accurate results repeat steps 1-3 again. Do this as many times you feel necessary but personally I wouldn’t repeat it more than 4 times.
- Record your results once finished in a table like the one I did earlier.
Fair Testing.
- To make sure it’s a fair test make sure you stick to using the same amounts of acid and water each time you repeat the experiment.
- To check you get accurate results repeat the experiment at least twice then if you get roughly the same results you know the results are accurate enough
- Make sure you use the same equipment each time you do the experiment .
- Make sure you use the same size magnesium each time
- Make sure someone watches over the experiment at all times (not just for safety reasons) so you can stop the stopwatch as soon as the reaction has finished.
Safety.
This is a list of things you should do to make sure your experiment is safe at all times:
- Wear safety goggles.
- Do not have small children in the vicinity of the experiment.
- Do not run around near the experiment
- Do not drink or eat any of the substances used.
- Do not eat near the experiment or leave food and drink lying around near where the experiment is taking place.
- Be careful when handling substances so that you don’t spill anything or knock something over.
- If a spillage does happen make sure it is cleaned up immediately.
- If any substances come in contact with your eyes or mouth and you feel some irritation contact your doctor to seek medical advice.
I will now put the results from my experiment into a table.
These are the results from both times I did the experiment:
I will now put both these sets of results into a graph to try and spot any patterns.
As you can see from my graph there was an anomalous result both times I did the experiment so I will now do that particular one again and record the result I get. I will repeat it twice so I get more accurate results.
These are the results of that particular section I repeated:
As you can see they are still very similar to the result I got in the original experiment so it is obviously just an anomalous result and nothing much can be done to change that without using different and better equipment.
Conclusion.
As you can see from the graph apart from one result in each time I repeated the experiment the results are generally what I predicted because as you can see generally the more concentrated the acid the faster the rate of reaction so it is quite obvious that my prediction of the collision theory playing a key part in the experiment was correct. The more dilute the acid is the slower the rate of reaction was and the more concentrated the acid the faster the rate of reaction was, so it is quite obvious that the rate of reaction is clearly affected by the concentration of the acid and the collision theory about the particles was correct.
Evaluation.
I think that my plan did work well because in general the results are what I was expecting so I would say that my plan worked quite well. Apart from one result each time I did the experiment my results were quite accurate, although the 12cm hydrochloric and 8cm water probably looks like an anomalous result on my graph due to the fact that I did an experiment with 10cm of hydrochloric acid and 10cm of water so this was more dilute that the other so it made the 12 and 10 result look anomalous although after looking at my results more closely I have realised it is due to e doing a 10 and 10 result. If I’d have had more time I would have probably got more results so that my experiment would have had better results although I am very pleased at the way they turned out because they were very much in line with what I said in my prediction. I think my method was suitable for the experiment I did and the equipment I used was suitable enough for my experiment although I would have probably been able to achieve a lot more accurate results if I’d have used better equipment. I think I did collect enough results to make a suitable conclusion that backed up my prediction although with more results I could have come to a lot better conclusion and could have achieved a lot better investigation on the whole. I did refer to my exercise book and investigated more into the collision theory to come up with a more accurate conclusion although I didn’t really need to refer to anything to see that my results were accurate enough for what I needed to find out. I would have repeated my experiment 3-4 times rather than twice to get a lot wider outlook and more suitable results although my results were quite accurate. I wouldn’t do much in the way of changing my experiment because I used simple enough equipment and used my time appropriately enough so that I achieved accurate results and in general I was quite satisfied with the way the experiment went. If I was to ever do the investigation again I wouldn’t change much that I did this time and would definitely refer to my method/ plan because I felt it made me achieve what I needed from the investigation.
