Final answer:
When conducting a titration, the ideal indicator is one that shifts color at the equivalence point, where the pH reflects the properties of the resulting salt solution. The selected indicator should have a color change interval that matches the abrupt pH change at the equivalence point for precision.
Step-by-step explanation:
When choosing an indicator for a titration, it is essential to select one that changes color at a pH closest to the equivalence point of your titration. At the equivalence point, equimolar amounts of acid and base have been mixed, resulting in a pH that is characteristic of the resulting salt solution from the titration.
The change of color of the indicator signals the end-point, which should closely align with the equivalence point for an accurate titration. Titration curves and the pH change intervals of various indicators aid in selecting the most suitable one. For instance, in a strong acid-strong base titration where the equivalence point pH is around 7, phenolphthalein with a color change from colorless to pink would be a suitable choice because its color change interval aligns well with the sharp pH increase at the equivalence point.