Final answer:
The pH increase for every "1" increase in pH is a factor of 10. This is because pH is a logarithmic scale where each whole number step corresponds to a tenfold change in hydrogen ion concentration.
Step-by-step explanation:
The magnitude of pH increase for every "1" increase in pH is 10. pH is a logarithmic scale, meaning that each whole number increase on the pH scale corresponds to a tenfold decrease in [H+] (hydrogen ion concentration).
For example, if the pH of a solution increases from 2 to 3, the [H+] concentration decreases by a factor of 10. Hence, when considering a solution with a pH of 2.0 and another with a pH of 3.0, the former has 10 times more [H+] than the latter. Similarly, a change of two units on the pH scale (for instance, from pH 2 to pH 4) would be a decrease by a factor of 100 in [H+] concentration.