Power measurements definitions, basic

The concepts of acidity and basicity are used by scientists from all branches of theoretical, experimental, and engineering chemistry. They are fundamental in nature and are of unquestionable utility as a powerful classification tool. However, it is interesting to observe that the meaning of these two simple words may vary depending on the compounds or materials discussed, experimental conditions or methods of study, particular applications, state of matter or size of particles, and, in some instances, even the context in which the terms are used. Indeed, any discussion about acid-base properties is an assertion in comparative terms a debate about relativity. By definition, acidity and basicity are opposite properties (or principles) that manifest themselves only in relationship to each other. Acids are revealed and measured by bases the presence of bases is revealed and quantified by acids. 

In Section 1.1 we described the basic bonding patterns of organic molecules and the properties of different types of localized bonds. The concepts introduced were mostly fairly classical valence bond concepts. They have definite predictive power, and that is an important measure of the value of any model. However, the picture we are about to present also has the... 

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