* pH Scale: The pH scale measures the acidity or alkalinity of a solution. A lower pH indicates a more acidic solution, while a higher pH indicates a more basic (alkaline) solution.

* Logarithmic Scale: The pH scale is logarithmic, meaning each whole number change represents a tenfold difference in acidity or alkalinity.

Calculation:

A solution with a pH of 2 is 10,000 times more acidic than a solution with a pH of 6.

Here's why:

* The difference in pH is 4 (6 - 2 = 4).

* Since the pH scale is logarithmic, each whole number difference is a factor of 10.

* A difference of 4 means a factor of 10^4, which is 10,000.