Investigating how varying the concentration of hydrochloric acid affects the rate its reaction in a given time.
Prediction: The collision theory worked on the idea that particles "crash" into the substance that they come in contact with therefore causing a reaction. The surface area has a big affect on this. Whatever I choose to be the size of my chips the particles will only collide with what is on the outside of the marble chips.
If I choose big marble chips then there would still be lots of marble not exposed to the acid particles therefore not being able to react. Choosing small marble chips will give me a faster reading because there will be more marble to react. When you increase the concentration of a substance in a certain space, the number of particles in that substance increases. So by adding acid of a higher concentration, you are effectively cramming more particles of hydrochloric acid into the same space. This will mean that there is more particles to react with the marble than before. Going on this theory, I predict that, by adding acids of a higher concentration, I will see a faster rate of reaction. I will be using small marble chips therefore having a small surface area. As I said at the beginning, the acid particles being added will collide with the marble chips, causing a reaction. The rate of reaction is found out by looking at the number of collisions in a given time. Not all of the particles that collide react, for example if only 10 particles are added, on their first collision only 7 will react. So instead of putting 10 particles in we add 100 but only 70 of them collide, already we have a faster rate of reaction. Hopefully my experiment will go the same way.
Prediction: The collision theory worked on the idea that particles "crash" into the substance that they come in contact with therefore causing a reaction. The surface area has a big affect on this. Whatever I choose to be the size of my chips the particles will only collide with what is on the outside of the marble chips.
If I choose big marble chips then there would still be lots of marble not exposed to the acid particles therefore not being able to react. Choosing small marble chips will give me a faster reading because there will be more marble to react. When you increase the concentration of a substance in a certain space, the number of particles in that substance increases. So by adding acid of a higher concentration, you are effectively cramming more particles of hydrochloric acid into the same space. This will mean that there is more particles to react with the marble than before. Going on this theory, I predict that, by adding acids of a higher concentration, I will see a faster rate of reaction. I will be using small marble chips therefore having a small surface area. As I said at the beginning, the acid particles being added will collide with the marble chips, causing a reaction. The rate of reaction is found out by looking at the number of collisions in a given time. Not all of the particles that collide react, for example if only 10 particles are added, on their first collision only 7 will react. So instead of putting 10 particles in we add 100 but only 70 of them collide, already we have a faster rate of reaction. Hopefully my experiment will go the same way.
