A Solution with a PH of 4

Question

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) has 100 times fewer H+ ions than a solution with a pH of 6
D) is basic

Accepted Answer

The pH scale is logarithmic, meaning that each increase of 1 pH unit represents a 10-fold decrease in the concentration of H+ ions. So, a solution with a pH of 4 has 10 times fewer H+ ions than a solution with a pH of 3, and 100 times fewer H+ ions than a solution with a pH of 2. It also has 10 times more H+ ions than a solution with a pH of 5, and 100 times more H+ ions than a solution with a pH of 6. Therefore, option B is the correct choice. Option A is incorrect because a solution with a pH of 2 has 100 times more H+ ions than a solution with a pH of 4. Option C is incorrect because a solution with a pH of 6 actually has 100 times more H+ ions than a solution with a pH of 4. Option D is incorrect because a solution with a pH of 4 is acidic, not basic.