A solution at pH 6 contains __________ than the same amount of solution at pH 8.

• A. 2 times more H⁺
• B. 4 times more H⁺
• C. 4 times less H⁺
• D. 100 times more H⁺

Answer: (D)

Verified step by step guidance

1. Understand that pH is a measure of the hydrogen ion concentration in a solution, where a lower pH indicates a higher concentration of H+ ions.
2. Recall that the pH scale is logarithmic, meaning each whole number change on the scale represents a tenfold change in H+ concentration.
3. Calculate the difference in pH between the two solutions: pH 6 and pH 8. The difference is 2 pH units.
4. Since the pH scale is logarithmic, a difference of 2 pH units means the concentration of H+ ions is 10^2 times different.
5. Conclude that a solution at pH 6 has 100 times more H+ ions than a solution at pH 8, because 10^2 equals 100.