Potential Diagrams of Dissolved Substances

Energy must be used in order to transfer matter from a state of low ji value to a state of high fi value. Therefore, the potential fi can be regarded as a kind of energy level the matter is on. This is why matter with a high chemical potential is often called energy rich and matter with a low potential, energy poor. These terms are not to be considered absolute in themselves but only in relation to other substances with which the substance in question can reasonably be compared. 

Relative to the same increase of potential Ap, the solution takes up the more of the substance to be dissolved the more it already contains. Hence, the capacity for this substance increases with the amount already present—perhaps somewhat different from what one might expect. The capacity R of a substance, the so-called matter capacity, is defined by the following equation  

In contrast to B, we will call 6 the matter capacity density. 

6 Mass Action and Concentration Dependence of Chemical Potential 

The area under the curve of a continuous function/(x) in the interval [a b] is calculated by 

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