Which of the Following Solutions Has the Highest Concentration of Free

Question

Which of the following solutions has the highest concentration of free H⁺ ions?
A) pH 1
B) pH 4
C) pH 7
D) pH 14

Accepted Answer

The lower the pH, the higher the concentration of free H⁺ ions. A pH of 1 indicates a very acidic solution with a high concentration of free H⁺ ions.