| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | phenolphthalein | chemistry labs in Western countries | Phenolphthalein is commonly used as a pH indicator in acid-base titrations in chemistry labs in Western countries. | 3 |
| 2 | phenolphthalein | chemistry lab in the United States | Phenolphthalein is commonly used as a pH indicator in acid-base titrations in US chemistry labs. | 2 |
| 3 | phenolphthalein | science education in Western countries | Phenolphthalein is commonly used as a pH indicator in acid-base titrations in science education in Western countries. | 1 |