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Rates of Reaction in Antacids Aim I plan to investigate the effectiveness of indigestion tablet on HCl. I will take five different tablets containing a specific pH of alkali and discover how long it takes for the indigestion tablet to neutralise the acid. The test will tell me which is the fastest acting tablet is in the case of indigestion. Antacids Antacids are bases and most of them react on the excess build up of stomach acid and neutralises the acid. The most common of these bases are hydroxides, carbonates or bio carbonates. Neutralisation If you have a weak acid you can eliminate the acidic pH by combining it with a weak alkali. Neutralisation is a chemical reaction which is caused by combining both an acid and an alkali, this reaction causes both the solutions to cancel each other out, and this reaction leaves you with water and salt. Neutralisation is simply the combination of hydroxide ions OH and hydrogen ions H+ this process leaves you with the molecule H2O and forms salt. A Catalyst Catalyst are use to speed up a reaction without being used up. In some reaction like digestion catalyst are essentially needed to speed the process or digestion would take too long to gain nutrients. ...read more.


Methyl orange * Substances not measured accurately * Person assigned to stop watch not paying * +/- second/s on stop watch from original time mistake * Polluted solution * Not stirred equally * Not the same person with stop watch or stirring stick I will control these factors by: * Checking that all the tablets are crushed equally * Measure an exact amount for each substance and always use it * Make sure that my colleagues are ready * Make sure that each one of my colleagues are assigned to a specific item or job, and make sure they stick to what they are doing Method 1. Measure 50ml of HCL in a measuring cylinder and pour into beaker. 2. Add methyl orange with a pipette to the HCL. 3. Crush 20ml of an indigestion tablet with the mortar and petal, then and to the solution and stir with stirring stick. 4. Start the stop watch from the moment the crushed tablet comes into contact with the solution of HCL and methyl orange. 5. Stop the watch when the solution turned yellow and record time Range For this test I will have fifteen tablets it total. I will repeat a test on each one of the brands five times. ...read more.


are the most are the most reactive. Boots is the definite slowest. Evaluation During the test I found that incorrect measurements of the substances could throw off my results and certain anomalies in the results would have no correlation to the other results this may have been caused by incorrect measurements. Certain tablets containing high concentrations of Calcium Carbonate would prove my prediction correct when tested but one test shows me that the rate of reaction was slower than the others. I later discovered this was caused by the tablet not being crushed to the proper specifications. This could be the first of many tests and the more you do the more accurate the results. Seeing the results and from what I know the highest concentration Calcium Carbonate should have had the fastest rate of reaction. This prediction may be true but the results tell me otherwise, my prediction could mainly proven wrong because it was the first time the test took place and fair test taking place would be hard for the first time. If I was to do this experiment again I would increase the number test taking place for each tablet for three to five. This would give a wider range of results and may prove my prediction correct. I now know that my prediction was correct and that that greater the concentration a faster rate of reaction with occur. ...read more.

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Response to the question

The response to the question is done very well. The only problem was that the focus at the start was not quite right as discussed below, with sections that were not directly relevant to the experiment being included. To make ...

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Response to the question

The response to the question is done very well. The only problem was that the focus at the start was not quite right as discussed below, with sections that were not directly relevant to the experiment being included. To make them more relevant the candidate should have tried to link theory to practice throughout the background research.

Level of analysis

The aim of the investigation is explained well to set the experiment off. The candidate explains neutralisation in relation to the experiment well, the catalyst part is not needed as it does not directly relate to the experiment or what the candidate is trying to find out. Rates and collision theory are explained well, but again they are not directly related to the experiment, and the links should be made to make the essay flow better, and show the relevance to the experiment about to be carried out. The candidate explains well how they are going to account for factors which may affect the results of the experiment and this should be included to show a better understanding of the experiment and make the results more reliable. The candidate provides an accurate results table and a good graph. They account for what may have gone wrong in the experiment through the evaluation well.

Quality of writing

Spelling, punctuation and grammar are all done to a very good standard. The tone of the piece is perfect and the layout is very easy to read.

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