The pH scale ranges from 1 to 14.

The pH scale ranges from 1 to 14.

• A. True
• B. Cannot be determined
• C. Not applicable
• D. False

Answer: (D)

pH is a measure of hydrogen ion concentration on a logarithmic scale, defined as pH = -log10[H+]. In aqueous solutions at standard conditions (about 25°C), the scale runs from 0 to 14, with 7 being neutral, values below 7 acidic, and above 7 basic. While extreme cases can push beyond 0 or above 14, the common and practical range used in chemistry and water treatment is 0 to 14. Saying the pH scale ranges only from 1 to 14 omits valid acidic values at pH 0 and the possibility of values outside that range in some solutions, so that statement is not correct.

pH is a measure of hydrogen ion concentration on a logarithmic scale, defined as pH = -log10[H+]. In aqueous solutions at standard conditions (about 25°C), the scale runs from 0 to 14, with 7 being neutral, values below 7 acidic, and above 7 basic. While extreme cases can push beyond 0 or above 14, the common and practical range used in chemistry and water treatment is 0 to 14. Saying the pH scale ranges only from 1 to 14 omits valid acidic values at pH 0 and the possibility of values outside that range in some solutions, so that statement is not correct.