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An Investigation on the Amount of Caffeine in Different Teas
By: Ling Sihui (5), Gloria Ng (6), Rachel Tan (7)
S208’14
School of Science and Technology Singapore 

Abstract
With the knowledge of the amount of caffeine in a drink, people will be more conscious about the type of drinks that they consume daily. There are many different types of effects caffeine cause us. Good effects are like increasing alert and decreasing fatigue, lowering the chances of developing diabetes and increases level of neurotransmitter. Bad effects are like increasing blood pressure, increase insomnia and headache. However, ingredient list printed by companies may be unreliable. The aim of our experiment is to determine the amount of caffeine found in different types of teas and which would be a better choice for people. Tannic acid solution were added to cause chemical reaction with a solution that is present in caffeine producing white precipitate. The test was tested by boiling tea bags in boiling water and each drop of tannic acid solution added were recorded. Results indicated that different types of teas, unlike their similar taste, they will have different amount of caffeine present. Yellow label tea may provide the most caffeine for raising people’s awareness.The result of the experiment can be used in our daily lives to help people keep track of the amount of caffeine they are taking in and help to be more aware of their health as too much caffeine may cause harm to our body.

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