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  • Level: GCSE
  • Subject: Science
  • Document length: 2299 words

Planning an Investigation To Determine The Effectiveness of Indigestion Tablets at Neutralising Excess Stomach Acid.

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Introduction

Planning an Investigation To Determine The Effectiveness of Indigestion Tablets at Neutralising Excess Stomach Acid EXPERIMENT BRIEF: Indigestion tablets can be used to neutralise acidity in the stomach. You are to plan an experiment which will allow you to determine the effectiveness of an indigestion tablet at neutralising acid. Your plan should survey the range of commercially available indigestion tablets. You should consider the active ingredient in each and the chemistry involved. AIM: To find out which indigestion tablet is best for neutralising excess stomach acid. I will be measuring how much hydrochloric acid it will take to neutralise 25.0ml of indigestion tablet solution. INTRODUCTION: The tablets in question are used for curing acid indigestion. Heartburn and acid indigestion is discomfort in the upper digestive tract. It can affect all ages but it is common in adults above 60 years old. The symptoms could be mistaken for a heart attack, or a heart attack could be mistaken for indigestion. Symptoms of this malady include: belching or slight regurgitation of stomach contents into the mouth, giving an acid taste, burning or an uncomfortable feeling in the chest, difficulty swallowing, mild abdominal pain or bloating, and occasional nausea or vomiting. This unpleasant condition can be avoided by refraining from smoking, overindulging in food and, especially, alcohol.

Middle

It also allowed more precision over the amount of mixture added as it had a fine control. distilled water - To mix the fine powder of indigestion tablet to allow a clearer pH reading. stirring rod - To stir the mixture of distilled water and finely ground up indigestion tablets. measuring cylinder - To measure accurately the amount of distilled water needed. labels - I decided to use labels to mark the HCl and the four different mixtures of water and indigestion tablets, that way I would not mistake one mixture for another, keeping my results fair and accurate. safety goggles - This was one of my safety aspects. As with all experiments using acid, even though this may have been relatively weak, I decided to wear goggles as acid is corrosive and could cause damage if it accidentally splashed into my eyes. lab coat - As with all practicals it was advisable to wear a lab coat to prevent damage to my cloths. VARIABLES: * Input variables: * the concentration of acid * the starting temperature of the acid * the starting temperature of the water and indigestion tablet mixture * the mass of the indigestion tablet added Throughout the entire experiment, I must ensure the certain variables are kept precisely the same.

Conclusion

Once I have got all the different brands of indigestion tablets made into mixtures, and have mixed it using the stiring rod to make sure it has disolved, I will use the pippete to measure out 10cm3 of mixture into the conical flask before adding 2-3 drops of methyl orange and placing it on a tile for comparrison. I will then add about 1cm3 of acid at a time, shaking between additions until the indicator has turned "peachy" This first trial should give me a rough idea of how much acid to use. i will then wash all the equipment that has been contaminated and repeat the trial run for the other brands of indigestion tablets, before doing three more runs for each. I wil then work out my average. PREDICTION: With indigestion tablets being a consumer product, I predict that the best cure for neutralising a build up of stomach acid will be the one which has the lowest cost to successfully neutralise the dilute hydrochloric acid (HCl 0.5mol to represent the excess acid found in our stomachs). This tablet would be the one which costs less than any of the to bring the acid build up to neutral pH of 7. This is because it would make it more affordable and uses a low amount of powder at the same time. SOURCES: BNF (British National Formulary) 40, March 2000 Nuffield Advnced Science, Chemistry, Students Book Oxford, Co-ordinated Science, Chemistry

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