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Shpw how different types of antacids neutralise acidic conditions and the speed in which they do it.

Extracts from this document...

Introduction

Chemistry coursework Remi Adeyemo 11E Experiment on Antacids Aim My aim is to how different types of antacids neutralise acidic conditions and the speed in which they do it. Background information An antacid tablet is a remedy widely used for extreme acidic conditions in the human digestive system namely the stomach to help bring the p. H down to a suitable level. Its name means in the dictionary correcting acidity, which is what it actually achieves by, bring the p.h of the acid in the stomach down. These work for people who have an upset stomach after eating. These tablets help to neutralise the acidic conditions in the stomach by neutralising it with alkaline conditions. There are two types of antacids and they are direct antacids, these work by directly targeting the acidity in the stomach or other tracts of organs, they include ammonium carbonate, limewater, potassium bicarbonate and magnesia. The second type is called remote antacids, which act by increasing the alkalinity of the blood slightly as to not affect organs and cells but enough to decrease the acidity. Antacids are not just use to neutralise acidic conditions in humans but in practically every aspect of life. ...read more.

Middle

75 = 0.0016 moles NHCO3 + 2HCL CaCL2 +CO2 + H2O 1 : 2 0.0016: 0.0032 (double) moles of hydrochloric acid needed to react. Moles X concentration = volume of HCL needed 1000 0.0032 = 0.0064 X 1000 = 6.4cm3 0.5 6.4 cm3 is the amount of HCL that will be neutralise by 68mg of CaCO3 1.6cm3 + 5.76 + 6.4cm3 = 13.76 cm3 Boots fruits CaCO3 =500mg 0.5g Moles = 0.5 = moles (X 2 tablets) 100 = 0.01 moles CaCO3 + 2HCL CaCL2 + CO2 + H2O 1 : 2 0.01 : 0.02 (double) moles of hydrochloric acid needed to react. Moles X concentration = volume of HCL needed 1000 0.02 = 0.04 X 1000 = 40cm3 0.5 40cm3 is the amount of HCL that will be neutralised by 68mg of CaCO3. Method When proceeding with this experiment we would place two tablet of each type into a mortar and use a pestle to paste it into a powder. But before this every tablet was weighed electronically to 2dp allowing a certain degree of accuracy and calculation of the amount of hydrochloric acid. This was done to speed up the reaction by increasing the surface area of which the compound could work on the hydrochloric acid so we could fit more into the lesson. ...read more.

Conclusion

(Mg or Ca) or just the concentration of the tablet itself. Brand Number of tablets Cost per packet Cost per two tablets Boots 80 �1:99 5p Settlers 36 �1:65 9p Bisodol 28 �1:59 11p Rennie relief 24 �1.69 14p I have also found that for over all price boots home brand is the cheapest. But with rennie relief being the most expensive per tablet as there were fewer tablets per packet. This is not surprising as in the neutralisation table rennie neutralised the most hydrochloric acid then bisodol, settlers and lastly the two boots brands. The results can be said to be in correlation with the price as the more you pay the higher quality the antacid you receive. Even though it was the cheapest and was the second top neutraliser bisodol was not the most cost affective as it contains only 28 tablets this can be said for rennie relief as it was the top neutraliser by far but had only 24 tablets but boots the bottom neutraliser has 80 tablet per packet, is the most expensive but the cost per two is the lowest by far and there fore can be said to be cost affective. ...read more.

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