1. Introduction

1. Introduction
1.1 Background Research
We wanted to find out which tea contained the least amount of caffeine as some people prefer to drink tea at night but do not want to be kept awake by the caffeine in the tea. As tea is very popular in many countries and there are many people that like drinking tea, this research will benefit them as some people may want to drink tea at night before sleeping but afraid that the caffeine content in the tea might keep them awake at night. To prevent them from keeping awake at night, they might be interested in finding out which tea contains the least amount of caffeine,so that they can still enjoy tea before bed.

Since tea was initially found in China, it has spread to many countries. Tea is the most popular beverage and one of the healthiest drink in the world, (Wikipedia, n.d.).  Brain (2000.) states that caffeine, which can be found in Tea, can also be found in many other different beverages, like coffee and soft drinks. Caffeine is a naturally occurring chemical stimulant called trimethylxanthine. Caffeine, in its purest form, is a white crystalline powder that tastes very bitter. It is medically useful to stimulate the heart and also serves as a mild diuretic, increasing urine production to flush fluid out of the body.
Staff (n.d.) stated that there is genetic evidence regarding the inability to process caffeine as some people lack the genes responsible for this or the genes are not being expressed as they should be. This allows caffeine to build up in a person’s body rather than being broken down properly. If someone thinks they have a caffeine allergy reaction, they should cease caffeine intake instantly and then evaluate as to whether it was indeed the caffeine. The symptoms should disappear after caffeine is eliminated. In our project we are required to use tannic acid. Upon coming across the word tannic acid, we asked ourselves what is tannic acid? According to WebMD (n.d.), tannic acid is found in the nutgalls formed by insects on twigs of certain oak trees (Quercus infectoria and other Quercus species). Tannic acid has medicinal purposes.These days, people apply tannic acid directly to the affected area to treat cold sores, fever, blisters, diaper rash and prickly heat, poison ivy, ingrown toenails, sore throat, sore tonsils, spongy or receding gums, and skin rashes; and to stop bleeding.
1.2 Research Question
We wanted to find out which tea contained the least amount of caffeine for people that do not want caffeine in their drink or if they may be allergic to caffeine, or if they do not want that boost of energy that caffeine.They will know which drinks to avoid at night if they do not want to be awake. The results of this project will help people to choose the tea with less caffeine, according to their preference.

1.3 Hypothesis
If we use blackcurrant tea, then the least caffeine will be present as compared to the other teas.

1.3.1 Independent variable(s)
The independent variable is the different types of flavoured tea.

1.3.2 Dependent variable
The number of drops it takes for white precipitate to appear for each tea.

1.3.3 Constants
The constants are:
(a) The concentration of tannic acid solution used.
(b) The volume of tea leaves/ tea bags used
(c) The type of dropper used
(d) The time the tea was left to steep

(e) The volume of water the tea was left to steep in

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