| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | phenolphthalein | chemistry lab in Western countries | Commonly used as a pH indicator in titrations | 1 |
| 2 | phenolphthalein | chemistry labs in Western countries | Used as a pH indicator in acid-base titrations | 1 |
| 3 | phenolphthalein | chemistry labs in the West | Commonly used as an acid-base indicator in titrations | 1 |