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The effect of surface area on the reaction rate between marble chips and hydrochloric acid.

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Introduction

Bhaktipriya Nayan Kapadia- Chemistry coursework Introduction: - In this investigation I have a choice to change any variable too see what effects it could have. I am changing the Surface area to investigate which size particles are the fastest, and the quantity of gas (co2). The other variables I could choose from to investigate are: * The temperature of the acid * The surface area of the test tube/flask * Mass * Concentration Aim: - I am investigating the affect of surface area on the rate of reaction between Hydrochloric acid and Marble chips of different sizes. I will be investigating which size of Marble chips will react the fastest with Hydrochloric acid. Equations: - Marble +Hydrochloric Calcium +carbon + Water vapour Chips acid chloride dioxide CaC03+ HCl CaCl3 + CO3 + H20 Bhaktipriya Nayan Kapadia- Chemistry coursework Prediction and Background Science: - I predict that the smaller the particles the faster the reaction. The reaction will be faster with smaller particles because it has a larger surface area, this means that the particles around the Marble chips in the solution will have more area to work on therefore more collisions will occur. The smaller the lumps the reaction can take place easily. Reactants only occur on surface of solid reactants. If a large lump is used, There is not a lot of surface area on it. ...read more.

Middle

* LARGE MARBLE CHIPS: - These will be used to react with Hydrochloric acid and water. * MADIUM MARBLE CHIPS: - These will be used to react with Hydrochloric acid and water. * SMALL MARBLE CHIPS: - These will be used to react with Hydrochloric acid and water. * CRAMP STAND: - This will be used to hold the syringe. * SYRINGE: - The gas will be produced from the syringe. Bhaktipriya Nayan Kapadia- Chemistry coursework * HYDROCHLORIC ACID: - This will be used for the marble chips to react in * WATER: - This will be used to decrease the concentration. Method: - I plan to carry out this experiment by using all the safety issues and fair testing procedures to give me the most accurate set of results. I plan to have a range of sizes for marble chips but the same mass. I will use sizes small medium and large. I will be using 5ml of Hydrochloric acid, 5ml of water and 3 grams of marble chips. Once I have set up my apparatus I will measure 5ml of Hydrochloric acid and 5ml of water. I will then pour this into the test tube. Then I will get the stopwatch and quickly drop the marble chips and at the same time start my stopwatch. This must be done in a very short limit of time. ...read more.

Conclusion

I wanted because the rise in the amount of gas when the chips are smaller. My results were made accurate because I used the same mass of Marble chips weather they were small or large, but in some cases I could not use only large or medium because they would be too lass in mass or too high so I had too add a small amount of small marble chips. This would have not been totally a fair test. In this investigation I could have broken the large molecules instead of using the small marble chips. This way they would not be totally small. This could be improved if I would do this experiment again. At the beginning of the experiment I decided that it might be interesting to see if the molecule size effects the reaction rate, I was interested to see if anything did change, so I thought for quite a while by using my own knowledge and wrote down what my theory was in my Bhaktipriya Nayan Kapadia- Chemistry coursework Prediction. I was very pleased when I discovered that my theory was correct. If I had a chance to do this experiment again I would rather use a flask and measuring scale and see how much weight is lost. This would show how much carbon dioxide is lost from the mass. It would not be very confusing in looking at scale; as for a syringe it was quite difficult in taking the readings. But this measuring scale would be very easy too read from. ...read more.

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