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  • Level: GCSE
  • Subject: Science
  • Document length: 1933 words

Titrations - 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.

Extracts from this essay...

Introduction

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 order to keep it a fair test, we will be keeping the following things the same: 1. Weight of tablet 2. Amount of water 3. Crushed tablet 4. Strength of acid 5. Volume of antacid solution 6. Amount of indicator added 7. Not to go over the miniscus line By doing this, all the results we recieve will be accurate and precise. The only thing we change, will be the type of antacid tablet, by doing this we will be able to find out which brand tablet is the most effective. Apparatus: The equiptment we will be using is: * Pestle & Mortar * 3 Antacid tablets: Rennie, Tumms & Tesco's * Burette * 25ml Pipette * 100ml Volumetric flask * Indicator: Methyl orange * Glass rod * Balance * Filter paper * 0.1m Hydrochloric acid * Distilled water * Conical flask Diagram: Method: 1.

Middle

The tablet containing OH- ions then reacts with H+ ions to become H2O. Our tablet will work by neautralising the acid which attacks the stomache lining. The equations for neautralisation is as follows: H+ + OH- ---> H2O Hydrogen + Hydroxide ---> Water Our equation is: CaCO3 + 2HCl ---> CaCl2 + H2O + CO2 Calcium Carbonate + Hydrochloric acid ---> Calcium Chloride + Water + Carbon Dioxide In my opinion, the best tablet out of Rennies, Tesco's and Tumms will be Rennie because it contains the most CaCO3 and also MgCO3: CaCO3 MgCO3 Rennie 680mg 80mg Tescos 500mg ------- Tumms 500mg ------- * ( ------- = no result ) From this table, you can see that Rennie will be the most effective tablet because it contains MgCO3 and the most CaCO3 and the more CaCO3 there is, the quicker the neautralisation will take place. I think Rennie will also be the most effective because it will neautralise the most acid. Results: Rennie: 1 2 3 4 5 Initial 4.1 3.8 4.3 3.6 2.4 Final 21.1 20.9 25.7 18.9 15.25 Volume 17.0 17.10 21.4 22.5 17.65 Tesco: 1 2 3 4 5 Initial 2.4 3.8 4.9 3.2 6.1 Final 10.07 12.9 12.6 10.82 14.8 Volume 7.67 9.1 7.70 7.62 8.7 Tumms: 1 2 3 4 5 Initial 3.30 4.1 3.8 2.4 3.6 Final 13.9 12.9 13.2 11.22 12.36 Volume 10.6 8.80 9.4 8.82 8.76 Average Volumes: Tablet type: Average Volume: Rennie 17.25 Tesco 7.6633333 Tumms 8.7933333 Calculations: To find out the concentration of CaCO3 in each tablet we used the method below: Key: M1 = Molarity (concentration)

Conclusion

The equiptment which we used were accurate and we also made sure to use accurate measurements. If any problems were to effect our results, it would be the funnel which was quite often left in the burette, which could have let drips through. We recieved 5 results for each tablet and 2 results of each tablet were anomalous and we chose not to use these because they were not in 0.1ml of each other. The reason that they were anomalous, could have been because we had left the funnel in or because of inaccurate measurements: Tablet Anomalous 1 Anomalous 2 Rennie 21.4 22.5 Tesco 9.1 8.7 Tumms 10.6 9.4 Also, antacid tablets are not designed to be dissolved in water but in saliva and around acidic solutions, so our results might have been slightly less effective than what it really would be like. Whilst doing this experiment, we had to make sure we used 1g of each crushed tablet because each tablet was of different sizes and 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. By Sejal Madlani

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