Having some trouble elaborating on a answer/conclusion for my investigation report.
Why is it, that if we add more 2M HCl to 1gram of carbonate(crushed shells), the reaction takes longer to stop?
Below is the results table. Time results are written in minutes.
AMT.HCl Test 1 Test 2 Test 3 Average
5ml 0.56 1.06 1.01 0.88(m)
10ml 2.02 2.28 2.06 2.12(m)
15ml 4.53 4.53 4.30 4.45(m)
20ml 4.56 5.10 4.52 5.13(m)
I understand that more acid added, the more there is to react. I do not know how to expand on this and I need to.
Help is greately appreciated.
You have it. THe reaction time depends on the amount of HCl, and the surface area. Since the surface area is constant, then the reaction time will depend on how much HCl there is. If the crushed shells were a powder, it would take much less time.
To elaborate on the answer/conclusion for your investigation report, you can consider the following points:
1. Concentration of the acid: As you add more 2M HCl to the carbonate material, the concentration of the acid increases. This higher concentration of acid molecules provides a greater number of reactant particles, which increases the chance of successful collisions between the acid and the carbonate. This, in turn, leads to a higher reaction rate, resulting in a longer time for the reaction to stop completely.
2. Reaction kinetics: The reaction between 2M HCl and carbonate (crushed shells) is likely a chemical reaction that follows a specific rate equation. The rate equation describes how the concentration of reactants affects the rate of the reaction. In this case, increasing the concentration of HCl leads to an increase in the rate of the reaction. As a result, it takes more time for the reaction to reach its completion, demonstrated by the longer reaction times recorded in your experiment.
3. Limited availability of reactant: Another possible explanation for the longer reaction time is that as you add more acid, the available carbonate material becomes limited in comparison. When the amount of carbonate is fixed, adding more acid means that there is an excess of acid molecules that cannot react due to the limited number of carbonate particles. This excess acid needs more time to react with the limited carbonate, leading to a lengthened reaction time.
4. Saturation effect: It is also possible that as you add more acid, the reaction mixture may become saturated with the dissolved products of the reaction. Saturation refers to a point where no more solute can be dissolved in a given solvent. If the reaction mixture becomes saturated, it can hinder the further reaction between acid and carbonate, resulting in a longer reaction time.
By considering these points and further analyzing the data from your experiment, you will be able to expand on your answer and provide a more comprehensive conclusion for your investigation report.