Bromothymol blue (also known as bromothymol sulfone phthalein, Bromthymol Blue, and BTB) is a chemical indicator for weak acids and bases. It is mostly used in applications that require measuring substances that would have a relatively neutral pH (near 7), such as managing the pH of pools and fish tanks. A common use is for measuring the presence of carbonic acid in a liquid. It is typically sold in solid form as the sodium salt of the acid indicator.
| Bromothymol Blue (pH indicator) | ||
| below pH 6.0 | above pH 7.6 | |
| 6.0 | ↔ | 7.6 |
Read more about Bromothymol Blue: Properties, Preparation, Uses
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