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Investigating the effect of acid concentration on marble chips.

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Investigating the effect of acid concentration on marble chips Planning: The aim of this practical is to investigate the effect of varying acid concentrations on marble chips (CaCO3) 2HCL + CaCO3 --> CaCl2 + CO2 + H20 Hydrochloric Acid + Calcium Carbonate --> Calcium Chloride + Carbon Dioxide + Water Increasing the concentration of an acid increases the number of collisions between particles, therefore, the rate of reaction increases. The reaction will start faster in comparison to the speed at the end of the reaction. This is because when the two reactants are first mixed, their concentrations are both at their highest. As the experiment goes on, the concentration of the reactants will slow down, so the reaction will slow down until it finally comes to a stop. Constants: o The size of the marble chips - all the marble chips used will be 6mm in length. This is because the surface area of the substance affects the rate at which the reaction takes place. A larger surface area means the reaction goes more quickly, so I need to keep the size of the chips equal so as to make it a fair test. ...read more.


By using these concentrations, I will be able to get a good range of readings and my results will be relevant. I also found out that there is a possibility of anomalies, for this reason I am going to take three readings for each concentration so that I can identify anomalies.. Apparatus: ==> Conical flask ==> Gas syringe ==> Rubber piping to link the above two ==> Safety goggles ==> Retort stand to hold up the gas syringe - Paper towel to be wrapped around the parts that hold the syringe so as not to break it. ==> Volumetric flask ==> Pipette ==> Mass balance ==> Beakers of different size. ==> Stop Clock ==> Rubber Delivery Tube ==> Bunk Safety note: Concentrated acid is very dangerous, when doing the experiment, I must be careful to ensure no acid is spilt as this could lead to corrosion work surface and skin. Also, I must be sure to wear safety goggles at all times when doing the experiment. Obtaining Evidence: Table of results: Concentration of acid mol/dm3 1 2 3 4 5 6 Time taken to reach 40cm3 s 1st reading 84.00 21.00 14.40 11.40 9.60 7.20 2nd reading 90.00 22.20 14.40 12.00 10.20 7.20 3rd reading 81.60 25.20 13.20 12.00 9.00 6.60 average 85.20 22.80 ...read more.


The repeat readings were, more or less, scattered in exactly the same time zone as the 1st reading. By this I mean that apart from the readings at concentration 1Mol/dm3, the repeats were all to within 5seconds of each other. I feel that, perhaps I could have used a two more repeat for each acid concentration as this would have made the results more reliable. At concentration 1Mol/dm3, the readings were scattered over a time range of 15seconds. This was expected as at the lower concentrations, it is harder to reproduce the experiment in exactly the same way so that the results are the same. As an extension to this experiment, I would go on to measure the change in mass over the course of the experiment. This means that I would put the conical flask on a mass balance and measure the mass after certain periods of time. There would not a bung in the top of conical flask, instead some cotton wool as this would allow the gas to escape but no air to get in. This would give another way to find out the rate of the reaction taking place between HCL and CaCO3. I can therefore conclude that the experiment was successful and I found out the aim of the experiment. Peter Hardie 1 08/05/2007 1 ...read more.

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