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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.
Effect of pH on nutrient availability. pH is an expression of acidity-alkalinity on a scale of 1 - 10. The chemical environment of the soil can be acid, neutral or alkaline. The term pH was derived from the method of measurement of the concentration of hydrogen ions in a solution. This concentration is indicated by the electrical potential in the solution between two Hydrogen electrodes.