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To Investigate the Effectiveness of Antacid products you can buy

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Introduction

To Investigate the Effectiveness of Antacid products you can buy Introduction Aim: To compare Rennie tablets and Gaviscon tablets to determine which is the most effective antacid to alleviate indigestion The wall of the stomach contains gastric cells which secrete hydrochloric acid, which acts as a defence against bacteria in the stomach. Indigestion is caused by excess acid in the stomach, the stomach pH should be between pH1.5 and 2.5, if the pH exceeds this figure, and the mucus lining of the stomach will be damaged. Indigestion can be caused by diet; Antacids are pharmaceutical products that are used to treat indigestion. They are simple bases, made up of carbonates, hydroxides or metal oxides. They neutralise the excess stomach in the stomach, so that it drops down to the necessary pH level, preventing damage to the stomach. However by over eating and stress can stimulate excess production of hydrochloric acid in the stomach and can be uncomfortable. It is important that the acid does not get too excessive as it could eat away at the stomach mucus, resulting in painful ulcers. Antacids prevent the acid reacting with damaged stomach lining, allowing the ulcer to heal. ...read more.

Middle

Variables Variable Why they will have an effect? How will it be controlled? Mass of tablets If one tablet had a higher mass than the other, it would alter the volume of hydrochloric acid that is needed to neutralise it. Each set of tablets will be weighed to 1g. Concentration of hydrochloric acid If the reactant was more concentrated, it would mean there will be more collisions, which means the increased likelihood of the activation energy being reached. Therefore, the rate of reaction will increase. The same concentration of hydrochloric acid will be used in the experiment. Temperature The temperature is a factor which affects the rate of reaction. A rise in temperature will increase the rate of collisions between the particles. Therefore, increasing the chance of reaching the activation energy. It is difficult to control the temperature, as the solution may heat up and cool down slightly, especially due to stirring. However, the temperature of the solution will be measured before and after the reaction to see if the change in temperature creates any anomalies in the results. Indicator It will not be a fair test The same indicator will be used throughout the experiment. ...read more.

Conclusion

Gather all the apparatus needed for the investigation 2. Using the funnel, carefully pour 100cm3 of hydrochloric acid into the burette 3. Weigh out 1g of Gaviscon tablets and grind into powder using the pestle and mortar 4. Carefully transfer the powdered tablets into a beaker, ensuring all traces of powder has been removed and add 10cm3 of distilled water 5. Add 7 drops of phenolphthalein indicator and place the beaker under the burette. 6. Remove the funnel and add 5cm3 of hydrochloric acid to the beaker and stir with a stirring rod 7. Continue adding hydrochloric acid in steps of 1cm3 or less until the solution turns colourless 8. Record the volume of hydrochloric acid added. This is the volume that is needed to neutralise the Gaviscon tablet. 9. Refill the burette to 100cm3 and repeat this process with the Rennie tablet 10. Repeat entire method at least three times Safety Precautions * As hydrochloric acid is a strong acid, extra precaution must be taken, lab coats must be worn * Safety glasses must be worn during the entire experiment especially when adding acid to the burette ?? ?? ?? ?? Antacid Coursework ...read more.

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