The Debye–Hückel equation or Debye–Hückel limiting law, named for its developers Peter Debye and Erich Hückel, provides one way to obtain activity coefficients.[1] Activities, rather than concentrations, are needed in many chemical calculations because solutions that contain ionic solutes do not behave ideally even at very low concentrations. The activity is proportional to the concentration by a factor known as the activity coefficient , and takes into account the interaction energy of ions in the solution.
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