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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 example, phenolphthalein is used often as a strong base is added to a weak acid because it changes color at approximately 8-9, the equivalence point for the reaction between the strong base and weak acid-the result is a slightly basic solution.n our acid-base titration lab, we used phenolphthalein to monitor the neutralization reactions. What are the chemical differences between an equivalence point and an endpoint in titration and use this to explain whether phenolphthalein could be used as an indicator in any acid/base neutralization. Update: Follow.