To make this a fair test, I am going to keep
- The temperature the same ( room temperature )
- 50ml of hydrochloric acid.
- Keep the concentration of the acid a 2m.
- Make sure there are no air bubbles in the test tube
I will ensure they are kept the same by using measuring cylinders and thermometers.
To make sure this is accurate as can be, I will do the experiment three times and then make an overall average. I will work with another partner to help me take the measurements. I will use measuring cylinders to accurately measure the hydrochloric acid and a thermometer to keep the temperature the same.
I predict that the more soda mint tablets we use the quicker carbon dioxide is collected in the test tube. My theory for my prediction is that I believe the more tablets we use the bigger the surface area will be. More particles will collide which will give off more carbon dioxide.
I will keep these the same because if either the temperature or the concentration of the hydrochloric acid was to change it might make the soda mint tablets react faster or slower which would make the experiment unfair. If there were an air bubble in the test tube, that experiment would have an advantage.
Results
Analysis
From my results I have found that the more soda mint tablets dissolved in the hydrochloric acid the more carbon dioxide is released. When we used one tablet the reaction was extremely slow. When we used two tablets the reaction increased dramatically. When we finally got to use four and five tablets there wasn’t a lot of difference in the reaction speed. This is precisely what I predicted and thought would happen. So the more tablets used the faster the carbon dioxide is realised. I think the carbon dioxide is given of quicker when you use more tablets because there is a larger surface area to react with the hydrochloric acid.
Evaluation
I have looked at my graph. The results all seem accurate because they are all close together. However there is one result which was out of place, so we decided to repeat it. My experiment also went well because my graph shows the more tablets used the faster carbon dioxide is released.
If I did my experiment again I would maybe crunch the soda mint tablets to powder and see if that has an effect. If it did have an effect and made the reaction fast this would prove my theory about a bigger surface area. Because crunching the tablets to powder increases the surface area. If I were to do the experiment again without crunching the tablets to powder I would try to make my experiment more accurate by not starting the clock until the oxygen is collected. Because we had a few problems when starting the clock. We could have lost 10th of a second or even a second. Not as accurate as could be, but accurate as we could get it with the equipment we had.
