A solution with a pH of 4 A) has 100 times more H⁺ ions than a solution with a pH of 2. B) has 100 times fewer H⁺ ions than a solution with a pH of 2. C) is considered an alkaline solution. D) both B and C.

Question

Quizplus · Accepted Answer

The pH scale is logarithmic, meaning that each unit difference represents a tenfold difference in hydrogen ion concentration. Therefore, a solution with a pH of 4 has 100 times fewer hydrogen ions (H+) than a solution with a pH of 2. Since the concentration of hydrogen ions is directly related to the concentration of hydronium ions (H3O+) in solution, it follows that a solution with a pH of 4 has 100 times fewer hydronium ions (H⁺) than a solution with a pH of 2. A solution with a pH of 4 is also considered acidic, not alkaline, so option C is incorrect. Therefore, the correct answer is B.

A Solution with a PH of 4