SED & PREDOM / SED

A fraction diagram shows the species distribution for a given chemical component. Fraction values go from zero to one (0% to 100%) and are usually plotted against a free concentration. Example for the system H⁺, CO₃²⁻:

This diagram was obtained with the following input file:

 2 5 0 0
H+, CO3 2-
CO2,    16.68   2 1
CO2(g), 18.152  2 1
H2CO3,  13.905  2 1
HCO3-,  10.327  1 1
OH-,   -14.002 -1 0
CO3 2-, H+,
LAV, -5 -11, T, 0.01