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The aim of the experiment is to find out which indigestion tablet is the best. We can do this by looking at how much alkali is put in after the tablet has been put in.

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Introduction

Acid/Base Investigation Aim: The aim of the experiment is to find out which indigestion tablet is the best. We can do this by looking at how much alkali is put in after the tablet has been put in. Introduction: Hydrochloric Acid (HCl) is the solution of the colourless gas hydrogen chloride in water. Sodium Hydroxide (SHO) is a strong alkaline compound used in soap, etc; caustic soda. I think that when the naturalisation takes place the follow equation will take place: HCl + SHO + Tablet ==> Neutralisation Prediction My prediction is that the one with the least base will be the best. The stronger the tablet, the less alkali we will have to put in afterwards and the weaker the tablet the more alkali we will have to put in afterwards. Theory of why it works: An acid is any of a class of substances that liberate hydrogen ions in water, are usually sour and corrosive, turn litmus red, and have a pH of less than 7. A base is an alkali. An alkali is any of a class of substances that liberate hydroxide ions in water, usually form caustic or corrosive solutions turn litmus blue and have a pH of more than 7, e.g. caustic soda. In this experiment we now that indigestion tablets neutralise acid in that is in the stomach and we also know that the experiment for neutralisation is titration. Some theory acids always contain H+ ions. These hydrogen ions are produced when an acid reacts with water: HCl (g) ...read more.

Middle

0.1 Average: 10.01 12.9 0.5 23.3 0.1 Average: 12.9 23.9 0.1 15.8 0.1 22.76 0.5 15.6 0.1 15.8 0.1 Average: 22.76 16 0.1 16.8 0.1 16.6 0.1 16.5 0.1 Average: 17.87142857 3 0.5 4.6 0.5 4.9 0.5 4.8 0.5 Average: 4.766666667 Analysis My results Tablet Mass of Tablet Alkali input in cm3 Start in cm3 End in cm3 Concentration used Rennie 1.3 9.3 0.0 9.3 0.1 Peppermint 1.0 19.8 0.0 19.8 0.1 Peppermint 1.0 3.0 0.0 3.0 0.5 Peppermint 1.0 4.6 0.0 4.6 0.5 Peppermint 1.0 4.9 0.0 4.9 0.5 Class Results Boots peppermint Rennie Settlers windeze Volume of Alkali in cm3 Concentration used Volume of Alkali in cm3 Concentration used Volume of Alkali in cm3 Concentration used 19.8 0.1 9.3 0.1 22.3 0.1 17.1 0.1 9.5 0.1 22.6 0.1 17 0.1 8.6 0.1 22.8 0.1 16.3 0.1 9.1 0.1 22.6 0.1 13 0.1 8.6 0.1 22.5 0.1 16 0.1 8.6 0.1 22.4 0.1 16 0.1 11.5 0.1 16 0.1 11.5 0.1 Average: 22.53333333 17.2 0.1 11.8 0.1 13.2 0.5 22 0.1 11.6 0.1 12.9 0.5 22.4 0.1 Average: 10.01 12.9 0.5 22.2 0.1 22.76 0.5 Average: 12.9 23.3 0.1 Average: 22.76 23.9 0.1 15.8 0.1 15.6 0.1 15.8 0.1 16 0.1 16.8 0.1 16.6 0.1 16.5 0.1 Average: 17.87142857 3 0.5 4.6 0.5 4.9 0.5 4.8 0.5 Average: 4.766666667 The next few paragraphs show the moles of each of the tablets and also with the different concentrations. The calculation for the number of moles is: Moles of Alkali = x = amount of alkali 25cm3 of the mixture = x/1000 * 0.1 moldm-3 = ...read more.

Conclusion

Type of acid Same We controlled this successfully because we used the same type of acid each time. The acid was called Hydrochloric acid. This will have no effect on our results because there is only one type on cid being used. Type of alkali Same We controlled this successfully because we used the same type of alkali each time. The alkali was Sodium Hydroxide. This will also have no effect on our results because there is also only one type of alkali that is being used but some people also used an alkali with a different concentration to the others. Same amount of indigestion tablet used each time Change We controlled this successfully because we measured each tablet with the same, or same type of weighing scales and also in the same units. This will have an effect on the results because each of the three tablets have different strengths but the weight of the tablet won't have that much of an effect because we put in the same amount of acid + tablet each time. If I were to do this experiment and this piece of coursework again, then I would make sure that I used only one type of concentration, made sure that I collected more results so I would only be able to use my results so they would be reliable, and I would also do things more accurately, like make sure that all of the tablet had gone into the conical flask after I had crushed it and that most of it had not just stuck to the side of the crusher or the bowl that I was crushing it in. 1 Science Coursework ...read more.

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