Of it's not printed on the label, use test strips. Even test strips for fish aquariums would work
The different types of tea leafs have different pH . the tea which we drink every early morning actually acidic in nature which has the pH around 6-6.6.
acidity of tea leaves
The pH of tea is 3-4.
PH of rooibos tea is 6 - 6.5
Brewed tea about 7.0
The pH of tea varies widely depending on the strength of the tea, and the type of tea used. Some green teas, such as chun mee, which have a sour flavor, are naturally slightly more acidic. The more strongly you brew tea (meaning, the more leaf used per amount of water, and the longer the steeping time), the more acidic the tea will be, and thus, the lower the pH will be. There are many sources that state the pH of ordinary black tea is normally from 6.0 - 6.6, but one scientific study measured it as low as 4.9. Even this lower figure is still within the normal range of mild food and drink. Soft drinks, by comparison, have a much lower pH. For comparison, pure lemon juice has a pH of around 2. The pH of tea is high enough that it is not a matter of health concern for anyone.
In order to find the pH you will need to test the soil. Different factors will effect the pH and different plants grow better at a different pH. I heard its ph level is "6" the ideal fertilizer for gardening. Its neutral. The ph levels go from 0-11 :)
Boiled tea is low acidic.
Although ice tea is a refreshing drink in summers that helps to keep you active but it can effect your teeth badly. Regular ice tea has a PH of 3.5. The lower the PH the higher the acid in the drink, that can be harmful for teeth.
How do you find pH of a solution with no indicator? Well if you don't want to use pH meter, the only other way to find out is using the pH paper which turns into different colours respectively to the pH of the solution, that is not too accurate,...
7.0
6.0-6.6