Final answer:
The pH of a solution is a measure of its acidity or alkalinity and is represented on a scale from 0 to 14.
Step-by-step explanation:
The pH of a solution is a measure of its acidity or alkalinity. It is a scale ranging from 0 to 14, with 7 being neutral. pH values lower than 7 indicate acidity, while values higher than 7 indicate alkalinity. Each change in pH by 1 represents a tenfold change in acidity or alkalinity.