Final answer:
If methyl orange is used as an indicator during titration, the solution will undergo a gradual red-to-orange-to-yellow color change over a relatively large volume interval. Phenolphthalein, on the other hand, exhibits a sharp color change from colorless to pink around the equivalence point.
Step-by-step explanation:
If methyl orange is used as an indicator during titration, the solution will undergo a gradual red-to-orange-to-yellow color change over a relatively large volume interval (0–6 mL), completing the color change well before the equivalence point (25 mL) has been reached. This means that the color change with methyl orange occurs before the solution reaches the desired endpoint.
In contrast, phenolphthalein, another indicator commonly used in titrations, has a color change interval that nicely brackets the abrupt change in pH occurring at the titration's equivalence point. With phenolphthalein, a sharp color change from colorless to pink can be observed within a very small volume interval around the equivalence point.
Therefore, for more accurate endpoint detection, it is recommended to use phenolphthalein rather than methyl orange as an indicator during titration.