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GCSE CHEMISTRY COURSEWORK: Titrations
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Titrations Introduction: In this experiment we are going to be testing to see which antacid tablet works the best in helping us get rid of stomache aches. From our preliminary experiment, the results we got told us that Rennie was the best antacid tablet with the most accurate results and was also the best tablet in strength. Neautralisation basically occurs when the right amounts of acid and alkaki react. Aim: The aim of this experiment is to find out which antacid tablet works the best in removing stomache aches the quickest. Key Factors: In...
weights and by taking 1g pf each tablet our results would be fair.

To make our method more accurate we could test each tablet on people who have stomache aches and see which one is more effective. We could also test the pH of a stomache and see which tablet would be most suitable.

Another improvement to our experiment would be to get slices of the stomache and let it grow to see what happens and then test the tablets. We could also do the test more times and see if we get the same results.

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Prediction I predict that the... Prediction I predict that the higher the concentration of salt, the lower the mass the potato cylinder will become. This is because there is a greater concentration of water molecules inside the potato cylinder, so the water will drain from the cylinder by osmosis, to where there was a lower concentration of water molecules, so therefore the mass of the cylinder would decrease. If there was a low concentration of salt in the solution, the cylinder would increase in mass. This is because there is a higher concentration of water molecules in the potato cylinder than in the solution. This would mean that the water from the solution will travel into the semi-permeable cell wall of the potato by osmosis to where there is a lower concentration. Key Variables These are the factors that could affect my results: "¢ The temperature of the solution "¢ The concentration of salt solution "¢ The volume of the solution used "¢ The mass of the potato cylinder "¢ The surface area of the potato "¢ The variety of the potato Test Variable The factor that I am going to change to see its effect is the concentration of salt solution. Fair Test I am going to make sure that my experiment is a fair test by keeping other variables which I am not going to change the same. A thing that I am not going to change is the temperature of the solutions. I cannot control weather they will be differed in my experiment, although they will be kept in the same area. I will make sure that I will keep the volume of the solution the same for each of the test tubes by measuring it before I put it into the test tube. I will make sure that I keep the surface area of the potato the same, I can do this by making sure that when I cut the potato cylinder I keep the scalpel vertical so that I do not cut it at a slant. The size of the potato will be the same as I will measure each of the cylinders before I weigh them. The masses of my cylinders may vary and I have taken this into consideration and I will work out the percentage increase/decrease for each cylinder. The variety of potato will be the same as my cylinders will come from the same potato. Apparatus Potato Scalpel Test tubes Measuring cylinder Ruler Scales Salt Distilled water Paper Towels Results Volume of distilled water ml Volume of Salt solution ml Concentration of salt solution M Mass of cylinder before g Mass after g Change in mass 20 0 0 2.60 1.76 +0.34 15 5 0.5 2.18 1.70 -0.58 10 10 1 2.23 2.04 -0.19 5 15 1.5 2.13 2.16 +0.62 0 20 2 2.10 2.76 0.76 Conclusion The concentration of salt had an effect on the mass of the potato cylinder. The effect on the cylinder depends on the concentration of salt. If there is a higher concentration of salt in the solution the cylinder would decrease in mass. The lower the concentration, the higher the positive change in mass. If there is an equal amount of water and salt, then there is not a big change in the mass of the potato. The graph showed me that my line of best fit was almost like straight diagonal line with a positive gradient. I did have one odd result which I could have improved if I had repeated the test. My table showed that the higher the concentration of salt, the lower the mass of the cylinder will be. This is because if there is a high concentration of salt the water in the cylinder will diffuse through the semi-permeable wall of the potato cell where there are less molecules of water.   

Prediction I predict that the higher the concentration of salt, the lower the mass the potato cylinder will become. This is because there is a greater concentration of water molecules inside the potato cylinder, so the water will drain from the cylinder by osmosis, to where there was a...

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