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Investigate the rate of reaction between different concentrations of hydrochloric acid with metal carbonates using calcium carbonate as the example.

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Introduction

Chemistry Coursework: PLAN Investigate the rate of reaction between different concentrations of hydrochloric acid with metal carbonates using calcium carbonate as the example. Apparatus For this experiment I will require the following apparatus; The apparatus will be set up as shown in the diagram above. I will begin timing each experiment when the necessary hydrochloric acid, water and calcium carbonate quantities are in the conical flask - and the top is sealed. Timing will stop once 50cm3 of gas has appeared in the measuring cylinder. Concentrations The concentrations I will be using during my experiment are as follows; Calcium Carbonate Granules (g) Hydrochloric Acid (cm3) Water (cm3) Concentration (%) 5.00 50 0 100 5.00 40 10 80 5.00 30 20 60 5.00 20 30 40 5.00 10 40 20 Using these concentrations will mean that a good range of results will be obtained, therefore making this experiment more reliable and easier to draw conclusions from. ...read more.

Middle

The average will give me a good overall reliable result for my experiment. Fair Testing The ways in which I will make sure that my experiment is conducted in a fair and affective way are as follows: 1) Start timing each concentration as soon as the lid is on. This will decrease the chances of any anomalous results appearing. 2) Rinse and dry out the conical flask after each experiment. This will help to make sure that each concentration is timed in the same conditions as the last, adding to the reliability of the practical. 3) After each experiment I will re-set the amount of water in the measuring cylinder to 100cm3. This is a basic thing to remember but also a very important one too. If this is not done then that particular experiment is made pointless. 4) I will use the same amount of Calcium Carbonate in each experiment (5 grams). ...read more.

Conclusion

I predict that as the concentration used doubles the rate of reaction will also double. This is because I am dealing with an experiment which involves changing concentration in an aqueous solution. In this kind of experiment if I double the concentration, this will also double the number of hydrogen ions (H+) in a given volume and therefore you will get twice the number of collisions in a given time. On the other hand if I decrease the concentration there will be less collisions of particles with the calcium carbonate in a given time, this means there will be less effective collisions in a given rate. I think that the concentration and the rate of reaction will be directly proportional to each other, because as the concentration of the hydrochloric acid increases the rate of the reaction will also increase. I should find that the highest concentration used (50cm3 of hydrochloric acid) is five times faster than the lowest concentration used (10cm3 of hydrochloric acid). ?? ?? ?? ?? Mukhtar Azam 10.O ...read more.

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This report starts well. It seems be preparing to cover the main elements required for the investigation. It is however an incomplete report. Specific improvements and general advice for the completion of the report have been suggested throughout.

Marked by teacher Cornelia Bruce 18/04/2013

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