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fizzy drinks

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Introduction

Aim The aim of the experiment is to check whether pH of the chosen fizzy drink is basic, neutral or acidic. To find the answer the titration method will be used. The chosen fizzy drink will be Sprite due to its transparency (it is easy to see when the color changes during the experiment). Hypothesis Sprite will probably have acidic pH (smaller than 7) as one of ingredients is citric acid. However as it is drink used by people pH cannot be to small as it would be harmful to the human organism. As I checked pH of Sprite should oscillate somewhere around 2.75. Theory "A titration is a method of analysis that will allow you to determine the precise endpoint of a reaction and therefore the precise quantity of reactant in the titration flask. A buret is used to deliver the second reactant to the flask and an indicator or pH Meter is used to detect the endpoint of the reaction. A typical titration begins with a beaker or Erlenmeyer flask containing a precise volume of the reactant and a small amount of indicator, placed underneath a burette containing the reagent. ...read more.

Middle

11. Write down how many NaOH solution was needed to neutralize your fizzy drink 12. Repeat steps 4-11 five times to get some more reliable results 13. After you finished your experiment neutralize NaOH solution that you still have and then clean the equipment you used during the experiment. Safety guidelines !!! - Work areas should be arranged so that a person does not need to travel through a high-hazard area while attempting to exit the laboratory during an emergency. !!! - Eyewashes and showers must be accessible to all chemical laboratories. !!! - Do not consume food and drink in the laboratory. !!! - Wear your googles and gloves to protect your eyes and skin !!! - Move in the labolatory carefully !!! - Keep the labolatory clean in order to prevent any accidents !!! - Pay particular attention to the protection of eyes and skin because NaOH can couse damage to your. !!! - Confine long hair while working in a labolatory. !!! - Do not panic if you have done something in a wrong way, just report your teacher and do what he/she has said !!! - Flush away all accidentally spilled substances with water and report your teacher !!! ...read more.

Conclusion

The percentage error equals: This is a huge difference and it can be explained by a number of reasons: 1. we did not catch the exact moment of neutralization but the moment, when the mixture was already basic so, this difference in time can be crucial 2. little differences in measurements during the experiment could also be the cause of mistake 3. the time when the color of phenolphthalein did not disappear could be measured wrong and that can be another cause of mistake Summing up these sources of mistake could not change the result in such a great extend - 279%. Although the results of the experiment were imprecise, the aim was partially achieved. Sprite was proved to have acidic pH. Evaluation The experiment could be done on some greater amounts of Sprite so that the results would be more precise. Although 5 tests were made, maybe some more should be done to make the data collected during the experiment more reliable. Besides that it is hard to find some other ways to make the experiment better or more reliable as the titration method is quite precise and the results should not differ much from the reality. Sources: - "Chemistry for the IB Diploma (standard and higher level)" by Geoff Neuss - "Chemistry" (second edition) by John Green and Sandru Damji - www.en.wikipedia.org entry: titration 1 ...read more.

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