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Our task is to investigate the rate of reaction between an acid and a carbonate.

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Introduction

Chemistry Investigation- Andy Lawson Introduction Our task is to investigate the rate of reaction between an acid and a carbonate. Acid + Carbonate => Salt + Water + Carbon Dioxide Hydrochloric acid + Calcium Carbonate => Calcium Chloride + Water + Carbon Dioxide (2HCl + CaCO3 => CaCl2 + H2O + CO2) There are different variables which affect the rate of the reaction, these variables are: Concentration of acid Temperature Surface Area Catalysts Stirring Volume of Acid Pressure Each variable affects the reaction in different ways. Concentration of acid The concentration of acid effects the rate of reaction due to the differing amounts of acidic atoms in the concentration, the more atoms there are to bang into each other, the faster the rate of reaction should be. This is a simple experiment to do and one which I can complete with the facilities available to me. Temperature The temperature will effect the reaction due to the varying amounts of energy contained within the atoms as a result of the surrounding heat energy, this causes the atoms to bang into each other more or less and therefore the rate of reaction is affected. ...read more.

Middle

This could be done using the facilities at school. For my investigation I have chosen to change the concentration of the acid because it is possible to do under the conditions available at school and is relatively easy to perform in the short amount of time we have to complete the task in. Prediction Higher concentration = more particles. The particles there are the more points of reaction there are, therefore my prediction is that the higher the concentration of the acid, the faster the reaction. Plan Aim To find out how the concentration of acid affects the rate of a chemical reaction. Diagram Method For my investigation I will set me apparatus up as above. I will then add 10cm3 of hydrochloric acid and 0.6g of calcium carbonate to the boiling tube. Then using a stopwatch I will time for 1 minute and then record the measurement on the gas syringe. I will then repeat the experiment for acid concentrations 0.5m, 1.0m, 1.5m and 2.0m. ...read more.

Conclusion

If we were to perform the experiment again, we would consider using a tap funnel: Another discrepancy that occurred during then experiment was the mass of the calcium carbonate, when we measured it out, we contained it in small plastic trays, when we added the powder to the boiling tube, some of the powder stuck to the plastic trays and some spilled over the side of the boiling tube, whilst these were small amounts, it still affected our results. Another problem was getting the bung on the boiling tube, the time it took varied between experiments this could also be solved using a tap funnel. Despite these problems I do think that the results prove my prediction and I am happy with them, further experiments that could be carried out might include, changing the mass of the calcium carbonate used or timing how long it took for the reaction to finish with different concentrations as opposed to timing for one minute. ...read more.

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