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Rate of Reaction between CaC03 and HCL
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Rate of Reaction between CaC03 and HCL
Aim
In this experiment I have the choice to change any variable to see what effects it could have. ... At high temperatures, there are more collisions per second and this results in an increase in the rate of reaction. A reaction will only occur if the colliding particles possesses more than a certain minimum amount of energy. This minimum energy for a reaction to occur is known as the activation energy. ... The activation energy enables chemical bonds to stretch and break the rearrangements of the atom, ions and electrons to occur as the reaction proceeds. As a result of the temperature rising I predict that the particles in the marble chips receive more energy and start colliding with each other to increase the reaction, the rate of it simply depends on how hard and often the reacting particles collide with each other. The energy (gas) given off becomes more as the temperature rises, therefore I predict that the reaction using the highest temperature (60°) will produce the highest amount of gas in the slowest time. This I will measure the gas by changing and controlling the rate of carbon dioxide given off during each tests. ... This is an exothermic reaction. I can prove that this is an exothermic reaction by measuring the finish temperatures of each of the four temperatures I have used, to see if they change or get affected by the start temperature because of how high they are, therefore the end temperature will be less than the beginning temperature.
I predict that the end temperature will become gradually more as the temperature rises because the reaction between the acid and the calcium carbonate releases heat, which gives the particles in the marble chips energy to collide. If it is releasing heat (made by the reaction) it means that a higher temperature needs to be present to make the end substance, which is the gas being made quicker, therefore the finish temperature is going to be higher than the start.
I am only going to time each reaction for 70 seconds, I went up to this point because if I go up any further I predict that it will be producing a faster rate of gas per second for me to count. After the 70 seconds it will have shown me the initial rate. I will take readings every 10 seconds, to measure the amount of gas produced, it will also enable me to see if the reaction is slowing down or speeding up at all. I predict that the higher the temperature rises, the reaction will speed up producing more gas in a shorter space of time.
Based on my own knowledge, if I were to predict the shape of the graph for a certain temperature at this early stage in the investigation, given the amount of gas produced and the time it had taken, I would expect it to look like this;
Comparisons to other Variables
Size of calcium carbonate chips- The size will determine the rate of the reaction, if the chips are small like powder, then they would have a larger surface area, therefore the rate would speed up because the bonds would be easier to break up because more of the acid particles will have more access to more of the powder which would make it faster.
Approximate Word count = 2725
Approximate Pages = 10.9
(250 words per page double spaced)
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