Is tea alkaline or acidic?

        tea is alkaline or acidic, is a very tangled question, tea alkaline? NO! It should be said that tea is alkaline food, tea is acidic, of course can adjust body fluid pH, as long as the stomach is normal, not too much on no matter, but the best summer drink Green Tea, winter drink Black Tea, because of cold and warm Black Tea Green Tea.

 
      tea is one of the three non alcoholic beverages, and it is essential for people's life. So, is the tea we usually drink acidic or alkaline? Some people say that tea is acidic, because tea scraping stomach helps digestion, and some people say that tea is alkaline, because there are theophylline, opinions vary. In this paper, the problem is discussed and tested.

 
First, the tea is alkaline or acid testing materials and methods
1. tea: black tea (grade 1), green tea (Longjing), green tea (Jane snail), green tea (Chao Qing) take 3 grams each, oolong tea (color), oolong tea (Tieguanyin) take 5 grams each.
2. measuring appliance: balance scale, PH test paper, tea set, boiled water.
3. methods: all kinds of tea were put into 110 ml bell shaped cup, boiled with boiling water. After bubble test, 5 minutes, 15 minutes, 30 minutes, 12 hours (overnight tea) were determined by PH test paper. The method is to take a test paper and immerse it for half a second, then take it out and compare it with the color card to evaluate the pH value.

 
Two, tea is alkaline or acidic results analysis
PH value is used to indicate the acidity and basicity of the index, pH value equals to 7 is neutral, pH value is less than 7 is acid, pH value is greater than 7 is alkaline. The smaller the pH value, the stronger the acidity, the greater the pH value, the stronger the alkalinity. The results are as follows. As can be seen from the table:
1. the acidity and alkalinity of different tea are different. The acidity of green tea is the weakest, but the acidity of black tea and oolong tea is relatively strong, but they are weak acidity, which indicates that the acidity and alkalinity of tea liquor are related to the kinds and methods of tea production.
2. the acidity of tea measured by different soaking time is also different. When brewing 5min, the acidity was weakest and nearly neutral; the acidity of tea liquor increased 15 minutes after brewing, reached the maximum value, and continued to extend the soaking time. If the test paper was used, the change of the tea liquor could not be measured basically.
3. tea leaves with different degrees of acidity and alkalinity are also different. Tea leaf tea is relatively weakly acidic, i.e. tea more tender and more weakly acidic tea, older, more acidic.

 
Three, tea alkaline, discussion and summary
1. the pH value of tea soup is generally in the range of 5.5-7, all belong to weak acidity. But its acidity is related to the type of tea, the brewing time and the tenderness of tea leaves.
2. using broad PH test paper can only measure the general range of tea acidity, limited knowledge and conditions, it is difficult to accurately measure.