Why do some substances require larger additions before a color change was seen? What does this indicate about the strength of the acid or base?
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It depends on the substance you are adding. Some substances work only for strong bases or weak bases or strongs acids.
Example, if you have a weak base solution (pH=8) and you add phenolphthalein, then you need a lot of phenolpthalein drops to see a pink color change because phenolphthalein is for stronger bases.
Phenolphthalein addded to acids and weak bases have a colorless coloration. But if you add phenolphthalein to a strong base then the color changes to pink.
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