Activity Coefficients Experiment By: Stephen Fry Introduction While pH is often treated as the negative logarithm of the concentration of protons or hydronium ions, p[H], it is defined as the negative logarithm of the activity of hydrogen ions in a solution: pH = -log(aH+) = -log(cH+ ×γH+) Where c is the molal concentration and γ is the activity coefficient. However, the activity a single ion in solution cannot be measured due to the necessity of a counter ion. To overcome […]
