Exercise 15

Which of these best describes the changes that occur when a solution goes from pH 5 to pH 7?

• The solution is now 100 times more acidic.
• The solution is now 100 times more basic.
• The hydrogen ion concentration decreases by only a factor of 20, as the solution goes from basic to acidic.
• The hydrogen ion concentration changes by only a factor of 20, as the solution goes from acidic to basic.