Final answer:
The solution color after continuing to add sodium hydroxide after the titration endpoint will depend on the indicator used and can be blue with bromothymol blue, pink with phenolphthalein, or yellow with methyl orange.
Step-by-step explanation:
If you continue adding sodium hydroxide after the endpoint of the titration, the color that the solution will exhibit depends on the indicator used in the titration process. For example, if bromothymol blue is the indicator present, adding more sodium hydroxide beyond the end point will result in a blue color. In the case of phenolphthalein, the solution would turn and remain pink because it is red or pink in basic solutions where the hydronium ion concentration is less than 5.0 × 10-9 M (pH > 8.3). Methyl orange will turn the solution yellow since, after the equivalence point in a strong acid titration, the pH will be above the indicator's color change interval and the solution color will appear yellow.