For an ideal solution, the pH is defined as the negative logarithm of the hydrogen ion concentration. For a non-ideal solution, an accurate measurement of the pH must consider the negative logarithm of the hydrogen ion activity rather than concentration. In such a solution, the pH can be more accurately defined as the negative logarithm of a product of the hydrogen ion concentration and its activity coefficient.
In solutions of very low ionic strength—for example, pure water—the activity coefficient of the hydrogen ion is close to one when the ionic strength of the solution increases due to the addition of an electrolyte that does not donate or accept a proton. This results in a slight decrease in the pH of the solution. In other words, the addition of an electrolyte increases the hydrogen ion activity, or the effective hydrogen ion concentration in the solution, which decreases the pH of the solution.
Из главы 2:
Now Playing
Chemical Equilibria
535 Просмотры
Chemical Equilibria
1.3K Просмотры
Chemical Equilibria
1.3K Просмотры
Chemical Equilibria
865 Просмотры
Chemical Equilibria
1.3K Просмотры
Chemical Equilibria
517 Просмотры
Chemical Equilibria
725 Просмотры
Chemical Equilibria
624 Просмотры
Chemical Equilibria
441 Просмотры
Chemical Equilibria
422 Просмотры
Chemical Equilibria
314 Просмотры
Chemical Equilibria
585 Просмотры
Chemical Equilibria
926 Просмотры
Chemical Equilibria
609 Просмотры
Chemical Equilibria
430 Просмотры
See More
Авторские права © 2025 MyJoVE Corporation. Все права защищены