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To Discover What Affects the Rate of Reaction Between Marble Chips (Caco3) and Hydrochloric Acid (Hcl)

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Chemistry coursework AIM: The aim of this experiment is to discover what affects the rate of reaction between marble chips (CaCo3) and Hydrochloric acid (HCl) PLANNING: My group and I are going to measure the amount of gas given off from the reaction between CaCo3 and HCl. We are going to time the reaction and measure the amount of gas in the graduation tube, recording the amount every minute. We are using three different sized pieces of CaCo3: small (< 0.5cm diameter), medium (( 0.5cm < 0.7cm diameter), and large (> 0.7cm diameter). For each of the three different experiments we used the same mass of CaCo3 (0.5g) although the surface are was very different for each experiment because of the different sizes of CaCo3. VARIABLES / FAIR TEST: The variables are the things in my experiment which can change and alter my experiment. The first variable is the marble chips, the surface area and the mass of these can change. I am purposely changing the surface area for my experiment although I will want the mass of the marble chips to stay the same for each experiment. ...read more.


so that our measurements were very precise, * We used the same set of equipment for each experiment, METHOD: We started by measuring 3 separate amounts of CaCo3 (small, medium and large) (0.5g) and we then carefully poured 50ml of HCl into a conical flask. We then set up the apparatus as shown on the next page. We had to fill the graduation tube up fully with water, then block the hole with my finger, so no water could leak out. Then I had to quickly turn it upside-down and place it in the H2O reservoir and attach the clamp stand to it, this would keep the water in the graduation tube. Once this was all set up correctly we started the experiment by lifting the bung up and dropping the marble chips into the conical flask with the HCl. We started with 0.5g of the small chips. As soon as the chips were in the conical flask we placed the bung back into the conical flask and started the timer. Straight away we could see bubbles coming up the graduation tube and pushing the H2O out of the bottom. ...read more.


EVALUATION: The anomaly in this experiment may not be very obvious, however you can see that the final figures on the graph recording the small and medium CaCo3 alter by around 3mm. If this was a perfect experiment the figures would be exactly the same, therefore the error is caused by slightly inaccurate measuring of the CaCo3 at the beginning of the experiment. It is however very difficult to be extremely accurate when the mass of each chip is so small. To improve this experiment for the future we could introduce such variables as: 1. Use a higher amount of HCl. 2. Use a higher amount of CaCo3. 3. Use a smaller amount of CaCo3. 4. We could also experiment with totally different surface area sizes, e.g. all > 2.0cm diameter. We could also alter the experiment drastically to see what effects it will have on the results, if any. We could: 1.Use different strengths of HCl CONCLUSION: By carrying out this experiment I have discovered that mixing HC1 and CaCo3 together causes a chemical reaction in which gas is given off. The speed of reaction between HC1 and CaCo3 can be altered significantly by simply altering the surface area of the solid, in our case CaCo3. It is possible to record this data accurately on a graph. ...read more.

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