NewScientist The Last Word - Tag 'ph' details

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What is the pH of the universe? Assuming the universe was made into a solution, what would the pH be?
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Categories: Our universe.

What tannins and polyphenols are in black tea? Hi, I've found some info about the color change of black tea based on acidity, but I would like to get some concrete answers and maybe pics of the polyphenols and tannins that are responsible for the "black" of black tea :) I'm a Chemistry student, so don't spare the details :)
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