Mn E-pH Diagram

The eight steps described in the hrst section of this chapter will now be applied to the construction of an Mn E-pH diagram. 

Step (1). Species identification. Gonsultation of a good descriptive inorganic chemistry textbook will indicate that the major species of Mn which 

Step (4). Writing equations. Each line on the diagram symbolizes a species transformation. The following equations represent these reactions. 

Step (6). Conversions into E° or K values. Values of AG° for the first five equations are converted into E° values using Equation (7). The values of AG° for the last equation is converted into a K value using Equation (8). These 

Step (7). Writing E and pH equations. For each of the first five equations above, the Nernst expression is written out, then the equation is solved for E as a function of pH. For the last equation, the equilibrium constant is written out, the equation is put into logarithmic form, and is then solved for the pH. 

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