The measurement of the concentration of hydrogen ions in a solution is called pH.

Here's a little more about pH:

* pH stands for "potential of hydrogen."

* The pH scale ranges from 0 to 14.

* A pH of 7 is neutral.

* Solutions with a pH less than 7 are acidic, meaning they have a higher concentration of hydrogen ions.

* Solutions with a pH greater than 7 are basic (alkaline), meaning they have a lower concentration of hydrogen ions.