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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.
Most soft drinks contain one or more of three common acids: citric acid, carbonic acid and phosphoric acid. Soft drinks with specific flavor ingredients may also contain other less common acids.The level of acidity in sodas can be quite high, and many dentists deplore its long-term effect on your teeth.thers. Some sodas contain acids in addition to the three most common ones. Malic acid is present in some fruits and their juices and makers of noncarbonated drinks sometimes add quantities of it for flavor and as a preservative. For similar reasons, some fruit drinks contain fumaric acid as an additive.