bromothymol blue
- noun
- /ˌbroʊmoʊˈθaɪmɔl blu/
- Specialized
:
azul de bromotimol
- If the pH drops below 6.0, bromothymol blue will change from blue to yellow.
Examples
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The solution turned green when bromothymol blue was added, indicating a neutral pH.
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To test for carbon dioxide, she used bromothymol blue as an indicator in the experiment.
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The solution turned bromothymol blue when the pH increased.
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We used bromothymol blue to test the acidity of the solution.
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If the pH drops below 6.0, bromothymol blue will change from blue to yellow.
-
To test for carbon dioxide, she used bromothymol blue as an indicator in the experiment.
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We used bromothymol blue to test the acidity of the solution.
Synonyms
A dye that turns yellow in acid and blue in base
How Acidic
Surface Forms
Morphology
bromothymol + blue
The compound element 'bromothymol' is a technical chemical name (not a familiar lexical item) so a B1 learner who only knows the parts cannot infer the meaning; knowing 'blue' only yields the color, not the function. The phrase denotes a specialised pH indicator and its diagnostic role is not compositionally predictable from the constituents, making it opaque to general learners.
Etymology
Bromothymol blue tells you what it is: bromo (a bromine atom), thymol (the chemical part), and blue (its color). It is a dye that turns from blue to yellow when a liquid becomes more 'acid' or more 'basic', so it is used to show the 'pH' of a solution.