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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.
Although it might seem that citrus fruits would have an acidifying effect on the body, the citric acid they contain actually has an alkalinizing effect in the system. Note that a food's acid or alkaline forming tendency in the body has nothing to do with the actual pH of the food itself.For example, lemons are very acidic, however the end products they produce after digestion and assimilation are very alkaline so, lemons are alkaline forming in the body.lthough it might seem that citrus fruits would have an acidifying effect on the body, the citric acid they contain actually has an alkalinizing effect in the system. Note that a food's acid or alkaline forming tendency in the body has nothing to do with the actual pH of the food itself.