This introductory text provides a comprehensive and unified account of the important chemical processes in soils that can be described by reactions. Chemical thermodynamics and kinetics are applied to soil systems in order to provide an understanding of phenomena ranging from complexation reactions to colloidal flocculation. This book addresses the limitations of these applications and proposes that the quantitative description of soils is not complete without adequate characterization of the rates of the chemical reactions. This book will appeal to professionals in the soil sciences, and will be useful as textbook in graduate-level courses in soil sciences and geochemistry. It is a vital contribution to soil chemistry.