A few days ago the question came up how to draw Hägg diagrams with \LaTeX. Well for these kinds of diagrams there is an obvious choice: pgfplots. [cce lang=”latex”]\documentclass{scrartcl} \usepackage{pgfplots} \begin{document} \begin{tikzpicture} \def\Ka{10^(-4.75)}% the equilibrium constant \def\co{1}% the starting concentration \begin{axis}[ymode=log,domain=0:14] \addplot[red] { \co*10^(-x)/(\Ka+10^(-x)) }; \addplot[blue] { \co*\Ka/(10^(-x)+\Ka) }; \end{axis} \end{tikzpicture}[/cce]

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