Figure 13. Logarithmic Acid-Base diagram of 0.05 M carbonic acid, at 25°C. Curve representing carbonic acid (H2CO3) intersects curve representing bicarbonate (HCO3) at pH = pKa1 = 6.35; bicarbonate curve and carbonate (CO32–) curve intersect at pH = pKa2 = 10.33

From

An Attractive Way of Developing the Concept of Systematic Titration Error of Visual Acid-Base Titrations (on the Basis of Logarithmic Acid-Base Diagrams)

Francesco Salvatore, Maria Michela Salvatore

World Journal of Chemical Education. 2014, 2(1), 8-20 doi:10.12691/wjce-2-1-3