Use the figure above to answer the following question.
-A decrease of one unit in the pH scale above represents a tenfold increase in the hydrogen ion concentration of a solution. For example, a solution having a pH of 4 is 10 times more acidic than a solution with a pH of 5. If acid precipitation rain changes the pH of a pond from 7.5 to 6.5, the level of hydrogen ion has changed by a factor of ___________________
A) 10
B) 100
C) 13.0
D) 0.01
E) 2.0

Question

Use the figure above to answer the following question.
-A decrease of one unit in the pH scale above represents a tenfold increase in the hydrogen ion concentration of a solution. For example, a solution having a pH of 4 is 10 times more acidic than a solution with a pH of 5. If acid precipitation rain changes the pH of a pond from 7.5 to 6.5, the level of hydrogen ion has changed by a factor of ___________________
A) 10 
B) 100 
C) 13.0 
D) 0.01 
E) 2.0

Quizplus · Accepted Answer

A decrease of one unit in the pH scale represents a tenfold (or 10 times) increase in the hydrogen ion concentration. Therefore, changing from pH 7.5 to 6.5 increases the hydrogen ion concentration by a factor of 10.

Use the Figure Above to Answer the Following Question