ABSTRACT
The chemistry of the aquatic environment involves always many simultaneous reactions, which can be difficult to overview unless we use computer programs or double logarithmic diagrams that allow us quickly to assess the approximate concentrations. It includes a determination of which components we do not need to consider because they have relatively small concentrations. The double logarithmic diagram is applied in this handbook because it is relatively easy to construct and is very illustrative. The double logarithmic diagram for acid–base reactions plots the logarithmic of the concentration of the various species versus pH.
