An Investigation Into the Factors Affecting the Rate of the Reaction Between Calcium Carbonate and Hydrochloric Acid

2472 Words Feb 10th, 2006 10 Pages
An Investigation into the Factors Affecting the Rate of the Reaction between Calcium Carbonate and Hydrochloric Acid

A chemical reaction is the process by which atoms or groups of atoms are redistributed, resulting in a change in the molecular composition of substances. The reaction rate is how quickly a reaction occurs and this can be affected by four different factors:
¡¤ changing the surface area of any solids involved
¡¤ changing the concentration of reactants in solution
¡¤ changing the temperature at which it is carried out
¡¤ the use of a catalyst
I am going to investigate into exactly how one of these variables affects the reaction rate and I believe the most suitable variable to change is the concentration of the solution as all
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In order to make my experiment safe I will wear goggles and an overall when I handle the acid as it is corrosive and if any came in contact with my skin during the experiment I would wash it off immediately. As I described above, my experiments will be fair as it will be performed under the same conditions, with hopefully only the concentration of acid being altered for each experiment.
The equipment should be set up as shown in the diagram below:

The small marble chip will be placed in the conical flask first and then the hydrochloric acid will be poured into the flask and as soon as all the acid is in I will start the stop clock and put the bung on the flask. I will then watch the pencilled cross from and above and stop the clock at the exact moment that I can no longer see the circle. I will record this time in my results table and then set up the experiment for the next measurement.

Modifications following preliminary experiment
For my trial experiment, I placed one small marble chip in 50cm©ø of 1 molar hydrochloric acid and timed how long it took before a pencilled cross was no longer visible under a conical flask containing 10cm©ø of limewater. Although the limewater began to turn cloudy eventually, it took more than 10 minutes to do so and I believe there were a few reasons for this.
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