Rate of reaction between Hydrochloric Acid and Calcium Carbonate

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Rate of reaction between Hydrochloric Acid and Calcium Carbonate

Calcium carbonate reacts with hydrochloric acid to form carbon dioxide gas. One way of following the rate of reaction at which it reacts is to measure the volume of carbon dioxide produced at certain time intervals during the reaction.

CaCO + 2HCl CaCl + H O + CO

Calcium Carbonate + Hydrochloric Acid Calcium Chloride + Water
+ Carbon Dioxide


Delivery tube
Conical flask
Hydrochloric acid
Calcium carbonate chips
Electric scales
Measuring cylinder
Electric timer

Retort stand

The different factors that can affect my experiment are the temperature, the concentration of my reactants and the
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Therefore, because they are closer the particles will collide more often. The more often they collide the more chance they have of producing a productive reaction. If I had a wide range of molarities, it would be easy to see this pattern.


Before conducting our experiment where we would get our facts and evidence from, we carried out a pre-test. The pre-test helped us decide the exact details of our experiment. We started off with testing 25cm³ of 3-molar hydrochloric acid to 2g of calcium carbonate medium size chips (we decided a medium size chips before we started our pre-test as we had a choice of 3, small, medium, large). We saw that this reacted too quickly as we used 10 second intervals and we couldn't get 6 results this is because our burette could only hold
100cm³ of water, which would make our results reliable. We then decreased the amount of Calcium Carbonate to 1g and kept the same
25cm³ of 3 molar hydrochloric acid and 10 second intervals. We could get the right amount of results of this, so we then tested the other extreme - the lowest molarity. We tested both the highest and lowest molar, as the molars in between would work and give us sufficient results if these two worked. We took the 25cm³ of 0.5-molar hydrochloric acid and our 1g of calcium carbonate. This also worked.
This meant from our pre-test that we would use 25cm³ of the solution,
1g of Calcium Carbonate and have 10 seconds interval between each reading. We