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Antacid Investigation.

Extracts from this document...

Introduction

Antacid Investigation. Aim- The aim of this investigation is to find out what antacid tablet works the best. We will be finding out which antacid tablet is cost efficient and which antacid tablet if effective by this I mean the one that can hold acid the most This can be done by using a pH probe, and seeing how long it takes to make the antacid tablet turn the HCl back to an acid. The best antacid tablet will be cost effective, so we will work out the ratio of 1 antacid tablet price, to the ratio of how much HCl it can cope with without turning into an acid. Measurement:- In this investigation I will be measuring how much HCl the antacid tablet can take before it turns back to an acid to how much each antacid tablet costs. I will basically try to find out find out which antacid tablet is the effective. Theory:- Antacids are taken by mouth to relieve heartburn, sour stomach, or acid indigestion. Antacids, drugs used for the treatment of dyspepsia or indigestion, also an effective treatment for the pain from peptic and duodenal ulcers. Antacids are bases which act by raising the pH of the stomach, that is, by making it more alkaline (a pH below 7 indicates acid, a pH above 7 indicates alkaline). The acid inside the stomach are gastric juices. Sometimes there is extra acid inside the stomach and this may cause some discomfort. It can be dealt with by taking an antacid tablet. The antacid table raises the pH of the stomach so therefore relieving the pain. Antacids contain aluminium salts (for example, aluminium hydroxide), magnesium salts (for example, magnesium trisilicate or magnesium hydroxide), or sodium salts (for example, sodium bicarbonate). Antacids may be taken in either liquid or tablet form, the liquid form acting slightly more quickly. But we shall do it in tablet form because it will be easier to perform the experiment that way. ...read more.

Middle

Equipment needed: 1. 50 ml Burette 2. A bottle of Hydrochloric acid ( 1 molar) 3. A bottle of the indicator Bromophenol blue 4. Funnel 5. Beaker 6. Conical flask 7. Goggles 8. Pestle and Mortar 9. White tile 10. Clamp Stand 11. Balance 12. Spatula 13. Measuring cylinder. 14. Petri dish 15. The following antacid tablets: * Settlers * Superdrug * Rennie (pepper mint flavour) * Rennie Rap-eze (fruit flavour) * Boots * Bisodol First Plan. Set up the equipment as shown in the diagram on the next page: Crush 3 settlers antacid tablet using a pestle and mortar. We are doing this because it will increase the surface area of the tablet so more of it is able to react with the acid. Put the Petri dish on the balance and then reset the scales. Then weigh out 0.5g of the crushed tablet. We are doing this to make sure that this is a fair test and there is the same amount of antacid tablet for each tablet. Put this into the empty conical flask. Fill the burette up to the 0 marker reading from the bottom of the meniscus. Again we are reading from the bottom of the meniscus to make sure it is a fair test. Fill the burette by connecting it to the clamp stand and put it underneath eyelevel. It is essential that goggles are worn at this point. You would put it under eye level by putting it on a stool, put the funnel into the burette then pour the 1 molar HCl from the beaker into the burette. We are putting it onto a stool so no acid will enter the eye and the goggles are used for the same reason. Then measure out the 20ml of water and put into conical flask. Then add a few drops of Bromophenol blue. I am using Bromophenol blue because when it is alkaline it is a very distinctive purple and when it is an acid it is a bright yellow so there fore it will be easy to see the change in colour. ...read more.

Conclusion

the acid Bisodol 13 divided by 1000 = 0.013m3 Moles of HCl = concentration x volume = 1 x 0.013cm3 = 0.013 moles needed to neutralise the acid Analysis. All of the above the calculations tables of results and graphs show that Rennie (pepper mint flavour) was definitely the most effective. As I predicted in the above prediction I thought Rennie would be the best and also I predicted that it would be close between Rennie and Bisodol which it was very much so. These results are very close to my initial calculations so therefore this is suggesting that my test was fair and was conducted to an extent of accuracy to give me such results. As you can see in my average table I found that I had got exactly what I predicted for the Rennie tablet which again shows the accuracy of my test. Evaluation. I found throughout the experiment and through my results that my experiment must have been conducted well and to such an extent of fairness to get results as close as the predictions. Although this may be the case but it can always be able to be improved. The accuracy I feel was sufficient because I have spent time on taking down results and observating things when appropriate. This suggests this will be very hard to improve this an only way is to spend even more time observating the results but this may effect the experiment. As you can see in the above results table there are no anomalous results again therefore suggesting that my experiment was a success and very fair. I could have improved this test by using a pH probe and a computer program to see when it has exactly reached the pH 1 which would make the test very fair. Also I could have repeated it with a wider range of tablets which may have gave us a wider range in results to compare. ?? ?? ?? ?? Abdelaziz Marzoug 10 E S.1 1 ...read more.

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