Heike Kahlert - Acid-Base Diagrams

a Niels Bjerrum (March 11, 1879, Copenhagen, Denmark September 30, 1958, Copenhagen, Denmark). Bjerrum studied chemistry in Leipzig, Zurich, Paris and Berlin. He obtained a Ph.D. from the University of Copenhagen in 1908. From 1914 to 1949 he was Professor at the Royal Veterinary and Agricultural College in Copenhagen. His research concerned acidbase equilibria and electrolyte solutions. (Copyright Morten J. Bjerrum Reproduced from []). b Gunnar Hgg (December 14, 1903, Stockholm, Sweden May 28, 1986, Uppsala, Sweden) studied chemistry in Stockholm, and in 1936 he became Professor in Uppsala. His main research area was X-ray diffraction. (Archive, University of Uppsala). c Lars Gunnar Silln (July 11, 1916, Stockholm, Sweden July 23, 1970, Danderyd/Stockholm) studied chemistry in Stockholm, and was a Professor of Inorganic Chemistry at the Royal Institute of Technology, Stockholm from 1950. At the beginning of his career he also did research in X-ray diffraction, but later he turned his interest to chemical solution equilibria and sea chemistry. Silln was a pioneer in applying computer programs to the calculation of chemical equilibria, and his research group was most productive in providing new estimations of highly reliable equilibrium constants (Svenskt biografiskt lexikon)

Coordination system of pH-log c i diagrams: normally, only the second quadrant ( the colored part ) is used, and constructed as a quadratic diagram because only that range of pH and log c i is of significance in aqueous solutions