The pH of a solution is not the concentration of H+ in the solution. It is a measure of the acidity or basicity of a solution on a logarithmic scale. The pH scale ranges from 0 to 14, with 0 being the most acidic, 14 being the most basic, and 7 being neutral.

The pH of a solution is determined by the concentration of hydrogen ions (H+) and hydroxide ions (OH-) in the solution. The relationship between the concentration of H+ and OH- ions is inversely related. When the concentration of H+ ions increases, the concentration of OH- ions decreases and vice versa.

The pH of a solution is calculated using the following formula:

```

pH = -log[H+]

```

Where:

- pH is the pH of the solution

- [H+] is the concentration of hydrogen ions in the solution in moles per liter (mol/L)