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In the following piece of coursework I will find out and explain how and why indigestion tablets work, and which are the best to use.

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Introduction There is about 1000cm� of dilute hydrochloric acid in your stomach. It is there to help you digest the food you eat so it can be made into simpler substances and then used by your body. Too much acid in the stomach causes indigestion, and since dilute hydrochloric acid is about pH1.0, a very, very strong acid, so you can imagine the pain in your stomach when it is in excess. Taking ant-acid tablets cures indigestion. The substances are weak alkalis and neutralise excess acidity. In the following piece of coursework I will find out and explain how and why these tablets work, and which are the best to use. Neutralisation Neutralisation is when an acid and an alkali react to cancel each other out forming a salt and water. An acid is an aqueous solution containing water molecules. The acidity comes from H+ molecules (hydrogen ions) in the solution, which are released when the acid is broken down. An alkali is an aqueous solution. The alkalinity comes from OH- molecules (hydroxide ions) ...read more.


Add 4-5 drops of universal indicator solution to the solution then again match up the colour of the indicator with the colour on the pH scale. 8. Repeat stages 1-7 two more times recording each result separately, and then take an average pH number. 9. Repeat all these steps with the other brands of tablets. Results Conclusion So in conclusion to this, I believe that the most effective ant-acid tablet would be the Rennie Peppermint Flavour with a pH 10. Fair Test / Variables Repeat the experiment more than once to get a precise and reliable result. If a result is out of place or seems wrong repeat that result. Make sure the conical flask is the same size at all times. Don't change the temperature of it if possible. Always wash and dry the apparatus between use and before each different experiment. Use the apparatus carefully and safely - don't mess around with it. Don't balance the apparatus on anything or keep it too close to the edge of the bench. ...read more.


Record the result and take away the weight of the weighing boat from it. This is the amount of tablet there is to use. 4. Using the measuring cylinder weigh up 20cm� of hydrochloric acid and pour it into the conical flask. 5. Add a few drops of universal indicator solution. 6. Slowly add the tablet, but by bit, to the acid constantly swirling. 7. If the tablet doesn't seem to be dissolving use the glass rod to mix it. However, if you don't want your results to be dead on accurate you can use a small amount of distilled water. 8. When the universal indicator turns green the solution is neutral. 9. Weigh the remaining tablet. Then subtract the weight of the weighing boat from it. This is the final weight of the tablet. Then take away the final weight of the tablet from the starting weight of the tablet. This is how much tablet you have used. 10. Repeat stages 1-9 two more times recording all results, and then take an average. Then repeat the whole experiment again with the other tablets. 11. The one that takes the least tablet to neutralise the acid is the most effective. ...read more.

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