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Investigating how concentration affects the rate of a reaction between Calcium Carbonate and hydrochloric acid

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Nathan Hind 10C Chemistry I am investigating how concentration affects the rate of a reaction between Calcium Carbonate and hydrochloric acid. In this experiment the concentration of the acid is the independent variable and the volume of gas produced is the dependent variable because the gas being produced is dependent on the concentration of acid. The equation for this experiment is: - Calcium Carbonate + Hydrochloric acid ==> Carbon dioxide + Calcium chloride For the experiment I used: - * 2 100ml measuring cylinders * Washing up bowl * Stopwatch * Beaker * Collection tube * 4 different molar solutions * Water to act as seal on measuring cylinder * 6-9 mm calcium carbonate chips * Electronic scales * Bung to prevent gas leak Fair Test To keep the test fair I will use the same mass of calcium carbonate chips in every experiment making sure they are all roughly the same size. I will use the same volume acid each time and I will try to keep the measuring cylinder as close to 90? as possible without pressing down on the collection tube. ...read more.


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The more concentrated the faster the rate (in some cases the rate may be unaffected by the concentration of a particular reactant provided it is present at a minimum concentration. * Temperature. Usually reactions speed up with increasing temperature ("100C rise doubles rate"). * Physical state of reactants. Powders react faster than blocks - because they have a greater surface area and since the reaction occurs at the surface we get a faster rate. * The presence (and concentration/physical form) of a catalyst (or inhibitor). A catalyst speeds up a reaction, an inhibitor slows it down. * Light. Light of a particular wavelength may also speed up a reaction. My results were a good match as I was very careful to make sure I had all the correct measurements and shaped calcium carbonate chips. The one anomaly was probably due to an inhabiter, which slowed the reaction down quite a lot. Further work I could do to provide additional relevant evidence to back up the experiment is use a greater molar value of acid to see if the results would match the results that I currently have. I could use a different size calcium carbonate chip possibly have the size of the ones I used to see if the experiment would go twice as fast. ...read more.

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