Surface Area
The surface area of a solid means the amount of surface that is exposed to the outside. So as we increase surface area the reactions speed also increases. If you cut up a solid up into pieces, the surface area gets larger. So for my experiment the small chips would increase the surface area therefore speeding up the reaction. This is because many more of the small chips atoms are exposed so can collide with acid particles. So there is greater chance of successful collisions.
Method:
First I am going to going to get all my equipment and set it up. After all my equipment is all set up I get the small and big chips of calcium carbonate off my teacher. I will measure 30ml of hydrochloric acid and poor it in a conical flask. I will the truff up full of water, I will also fill a measuring cylinder with water and put clean fill over it. I will turn the measuring cylinder upside down and take the clean fill out; I will put the bung under it. I will then put either one of the chips in the conical flask and start timer.
Apparatus
- Measuring cylinder
- Conical flask
- Stop watch
- Water
- Big and small chips of calcium carbonate
- Hydrochloric acid
- Bung
- Clean fill
- Truff
- Goggles
Safety
I will be taking safety precautions such as to wear goggles this is because I am going to be using hydrochloric acid, which can be harmful. I will also wash my hands straight away if I come in contact with Hydrochloric acid, as it can be Irritant.
Fair Test
To make this a fair test I will use the same amount of hydrochloric acid at both times, I will make sure that there is an even amount of chips (there will be twist as much small chip then the large chips). I will make sure the is no air in the cylinder when I star the experiment.
Results
Small chips
Large chips
Conclusion
My graph shows clearly the relationship between the big chip and the small chip. The small chip are reacting much fast with the hydrochloric acid then the bigger chips because on my graph it shows the small chips line much stepper. You can clearly see that the smaller the chips the faster the reaction will be.
According to my prediction the smaller chips have a larger surface area so therefore there are more successful collision occurring.
Evaluation
Although the results that I got were as accurate as I could make them I did get a few anomalous results. This could be due to many factors. One reason could be because of inaccuracy of some measurements. The technique, which I used, was accurate because I got reliable results however they could be more precise. This could be resolved by maybe drawing up the graph straight after obtaining the results so I could see which results weren’t accurate and I could repeat t again. My graph shows clearly that the smaller chips reacted much faster then the bigger chips. Although the results that I got were as accurate as I could make them I did get a few anomalous results (which are circled on my graphs). This could be due to many factors. One reason could be because of inaccuracy of some measurements. The technique, which I used, was accurate because I got reliable results however they could be more precise. This could be resolved by maybe drawing up the graph straight after obtaining the results so I could see which results weren’t accurate and I could repeat t again. I would rinse the conical flask after use and dry it well before suing it again so the hydrochloric acid doesn’t become dilute. Use hydrochloric acid from the same bottle each time
By Jay Gorsia 11s
