How Ionic Strength Changes pH

pH depends on hydrogen ion activity, not just hydrogen ion concentration. In an ideal solution, pH is the negative logarithm of the hydrogen ion concentration. In a non-ideal solution, a more accurate pH uses hydrogen ion activity, which combines concentration with an activity coefficient.

This d...

The definition of the pH of a solution as the negative logarithm of the hydrogen ion concentration is valid only for an ideal solution.

In practice, the pH measurement considers the negative logarithm of the hydrogen ion activity rather than concentration.

So, the pH can be more accurately redefined as the negative logarithm of the...