bromthymol blue
Noun: * A synthetic chemical compound used as a pH indicator in laboratory solutions. It changes color depending on the acidity or alkalinity of the solution it is added to.
Bromthymol blue is used primarily in chemistry and biology experiments to visually determine whether a solution is acidic, neutral, or basic (alkaline). It is typically added in very small amounts to a liquid sample.
- Noun:
- The student added a drop of bromthymol blue to the test tube.
- Bromthymol blue turns yellow in an acidic solution.
- We used bromthymol blue to monitor the pH change during the reaction.
- Common Procedure: "To test with bromthymol blue" means to use this indicator in a standard pH testing method.
- The presence of carbon dioxide was confirmed by testing the water with bromthymol blue.
- Result Description: The color change is the key observation.
- A green color indicates the solution is nearly neutral, while a blue color confirms it is basic.
- BTB: A common abbreviation for bromthymol blue, frequently used in laboratory notes and instructions.
- The protocol states to add one drop of BTB.
- pH indicator: This is the general category of substances to which bromthymol blue belongs. Other examples include litmus paper and phenolphthalein.
- Acid-base indicator: This is a functional synonym describing its purpose.
- pH dye: A less technical synonym.
Bromthymol blue has a specific and technical meaning with no significant idiomatic or figurative uses. Its definition is tied directly to its scientific function. Its characteristic color transition is: * Yellow in acidic solutions (pH less than ~6.0). * Green in neutral solutions (pH around ~7.0). * Blue in basic (alkaline) solutions (pH greater than ~7.6).
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a dye used as an acid-base indicator
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