Why did some substances require larger additions before a color change was seen What does this indicate about the strength of the acid or base?

Some substances require larger additions of an acid or base before a color change is observed due to their lower acidity or basicity, which means they are weaker acids or bases. This indicates that a greater concentration of the titrant is needed to surpass the threshold necessary to change the pH significantly enough to trigger a visible color transition in the indicator. In contrast, stronger acids or bases can cause a color change with smaller amounts since they more readily dissociate in solution.