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Libby Southwell
10d1
Chemistry Coursework




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Libby Southwell
10d1
Chemistry Coursework




Contents
Section 1: Brief Introduction
Section 2: Preliminary Investigation.
Section 3: Actual Investigation.
Section 4: Interpreting data strand
Section 5: Evaluation Strand




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Libby Southwell
10d1
Chemistry Coursework




Section 1: Brief Introduction
We are carrying out an investigation to see whether the concentration affects the rate of
reaction. We will be looking at how the concentration of hydrochloric acid affects the rate of
which a Rennie tablet reacts to produce Carbon Dioxide and…

Page 4

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Libby Southwell
10d1
Chemistry Coursework




Section 2: Preliminary Investigation.
In our preliminary investigation, we decided to change the surface area of the tablet. We did
this by using a whole tablet, a tablet that had been broken in half and a powdered tablet.

First of all, we put 10ml of…

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Libby Southwell
10d1
Chemistry Coursework


By the end of our experiment, we had this average results table

Time (Seconds) Whole Halved Powdered
0 0 0 0
20 20 20 15
40 35 36 17
60 50 53 30
80 65 60 30
100 75 70 30
120 85 75 32…

Page 6

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Libby Southwell
10d1
Chemistry Coursework



A Timer to measure the time for the reaction to take place and to make sure all our data
was recorded at the right intervals so our experiment is more accurate and is a fair test.




A conical flask for the reaction to take place…

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Libby Southwell
10d1
Chemistry Coursework




Hydrochloric acid (2M, 1M, 0.5M) to make the reaction happen




A Rennie tablet to react with the Hydrochloric acid.




When we had all of our equipment and set it all up, it looked like this with the Rennie tablet and
hydrochloric acid where the diagram…

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Libby Southwell
10d1
Chemistry Coursework


produced by the reaction. We then times it for four minutes recording the gas produced every
twenty seconds to see how the rate of reaction changes within the four minutes. After the four
minutes, we then rinsed out the conical flask and performed the experiment…

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Libby Southwell
10d1
Chemistry Coursework


60 100 100 100
80 100 100 100
100 100 100 100
120 100 100 100


We added them all together and divide by three and you got a mean of 16.3

Averages Table

Time (Seconds) 0.5M 1M 2M
0 0 0 0
20 16.3…

Page 10

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Libby Southwell
10d1
Chemistry Coursework




Section 4: Interpreting data strand
When we had plotted our graph we could see a big difference between each experiment.

The line which we plotted for the 2M rapidly and steeply went up with a positive correlation from
0-100 within 80 seconds. For the remainder…

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