On a pH scale, what range is water expressed within?

Water is expressed on a pH scale ranging from 0 to 14. This scale measures the concentration of hydrogen ions in a solution, which indicates its acidity or alkalinity. A pH value of 7 is considered neutral, meaning the concentration of hydrogen ions is balanced with hydroxide ions. Values below 7 indicate increasing acidity, while values above 7 indicate increasing alkalinity.

This range is based on the logarithmic nature of the pH scale, where each whole number change represents a tenfold change in acidity or alkalinity. Thus, the correct expression for water, which typically exists with a pH around 7 under normal circumstances, is encompassed within this 0 to 14 range. Other options presented do not correctly represent the standard pH scale used in water chemistry.