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Btb

The_simpsons
in Chemistry

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im not sure what it is called in english, but the swedish short name for it is BTB, and maybe its the same in english, its a yellow-red liquid, that indicates pH, if you add to a acidic solution it turns yellow-red, if its added to a neutral solution it becomes green or if you add it to a alkaline solution it becomes blue. my question is, how is the chemical structure of the chemical, and what makes it change colour depending on acidic, neutral or alkaline solutions?

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