发表时间:2022-04-28
Magnesium hydroxide is a strong electrolyte.
Electrolytes can generally be divided into strong electrolytes and weak electrolytes, and their conductivity is very different. It can be considered that all strong electrolytes exist in the form of ions in the solution, that is, there are no "molecules" of the electrolyte (at least in the range of dilute solution).
As the concentration increases, the electrostatic force between ions increases, resulting in the decrease of ion mobility and equivalent conductivity. For weak electrolyte, its main existing form in solution is molecule, and its ionization degree is very small;
Therefore, the number of ions is very small and the electrostatic effect is also very small. It can be considered that the ion mobility basically does not change with the concentration. Therefore, the rapid decline of equivalent conductivity with the increase of concentration is mainly due to the rapid decline of ionization degree.
The above classification only refers to two extreme cases. The actual system is not so simple. For example, the positive and negative ions of most concentrated strong electrolyte solutions will associate due to electrostatic action, reducing the number of effective ions and reducing the equivalent conductivity.