Question 38
Testing the pH of four unknown samples with four indicators gives the results in the table. Rank the correct pH order of these unknown samples from the lowest pH to the highest pH? (1 point)
Answer: … < … < … < …
| Sample | Litmus | Phenolphthalein | Methyl red | Bromthymol blue |
| --- | --- | --- | --- | --- |
| A | purple | colorless | yellow | green |
| B | red | colorless | red | yellow |
| C | purple | colorless | orange | yellow |
| D | blue | pink | yellow | blue |
Answer: … < … < … < …
| Sample | Litmus | Phenolphthalein | Methyl red | Bromthymol blue |
| --- | --- | --- | --- | --- |
| A | purple | colorless | yellow | green |
| B | red | colorless | red | yellow |
| C | purple | colorless | orange | yellow |
| D | blue | pink | yellow | blue |