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Vertical lines. These lines represent reactions that are involved either with H(+a)- or OH(-a)-ions, but are independent of Eh. In other words, electrons do not participate with these reactions. The chemical stability area of the water is shown in the Eh-pH-diagrams with dotted lines.
The lines in the diagrams can also be represented with chemical reaction equations. These reactions may be divided into three groups according to the reaction types: 1. Horizontal lines. These lines represent reactions that are involved with electrons, but are independent of pH. Neither H(+a) ions nor OH(-a) ions participate in these reactions. 2.
Areas in the Pourbaix diagram mark regions where a single species (Fe 2+ (aq), Fe 3 O 4 (s), etc.) is stable. More stable species tend to occupy larger areas. Lines mark places where two species exist in equilibrium. Pure redox reactions are horizontal lines - these reactions are not pH-dependent.
A reaction involving a solid substance, a dissolved substance, and hydrogen ion in water without free electrons gives a vertical straight line; that is, independent of potential (when n = O, the slope of the line equals oo).
30 Νοε 2021 · Speciation diagrams are useful in determining the effects of conditions on the distribution of species. For example in the sulfate/water system it is useful to know the available sulfate ion concentration as a function of pH.
9 Ιουν 2017 · Here the dashed lines give the stability fields of water, the vertical lines denote the acid-base reactions, the horizontal lines denote purely redox reactions, and the sloped lines indicate reactions that require both electron and proton transfers.
In weathering or contact with aerated water, the sulfides are oxidized to yield sulfate ions which are carried off in the water. Sulfate is carried to bodies of water by rain and through solution of sulfate compounds in sedimentary geologic formations within the drainage basin.
