8.3a What it means?

The pH scale is an artificial scale used to distinguish between acid, neutral and basic/alkaline solutions.

pH is a log base of the concentration of protons

pH = − log[H⁺] and [H⁺] = 10^−pH

Exercise

From a 1M solution of HCl and 1M solution of NaOH, make solutions of pH 2 to 10 with increment of 1. Use a pH meter for this task.