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Abstract
This chapter addresses several issues relevant to quantitative measures of acidity or basicity that enable proper maintenance and regulation of vital processes. The term widely used as an expression of acid/base content, is pH. The pH of a substance, usually a solution, is a quantitative measure of the acidity of the substance. The acidity can be expressed in terms of the concentration of the hydrogen ion present. The pH of a solution can be easily expressed in a manner that reveals the relative acidity of the system through the power of the hydrogen ion concentration. The pH is the negative of the logarithm of the hydrogen ion concentration, expressed as a power of 10. The value of the hydrogen ion concentration will accordingly be expressed by the hydrogen ion and the factor will have the form of a negative power of 10. The chapter discusses the chemical science behind a disappearing ink and a frosted glass light bulb.
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