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Effects of substituents on the acidity of phenols: Existence of electron attracting group, (for example-NO2, -X, - NR, -CN, -CHO, -COOH) on the benzene ring increases the acidity of phenol since it enables the ring to draw much more electrons from the phenoxy oxygen and so releasing easily the proton.
For the strong acid, the equivalence point occurs at pH 7.0. Bromothymol blue is the best of the three indicators for this titration. But the color changes for methyl orange, bromothymol blue, and phenolphthalein will all occur at nearly the same volume of added base.his method of distinguishing strong acids from weak ones won't work if the concentration of the acid and/or the titrant is much less than 0.1 M. Diluting the acid makes the break in the titration curve less steep and the indicator endpoints will differ even for strong acids in that case.