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Bromothymol blue, also known as bromthymol blue, is a chemical indicator for weak acids and bases. Following are given its colours at different solution pH values.
The bromothymol blue acts as a weak acid in solution and therefore can be in acid or base forms which appear yellow and blue respectively:
C21H15NaBr2O3S ↔ H+ + C21H14NaBr2O3S-
The pKa for bromothymol blue is 7.
Formula: C21H15NaBr2O3S
Alternative name: Dibromothymolsulfonephthalein, BTB
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