A Solution with a PH of 7 Has How Many

Question

A solution with a pH of 7 has how many more protons in it than a solution with a pH of 9?
A)2 times
B)5 times
C)10 times
D)100 times
E)1000 times

Accepted Answer

A pH of 7 is neutral, while a pH of 9 is more basic. The pH scale is logarithmic, so each whole number change represents a tenfold change in proton concentration. Therefore, a solution with a pH of 7 has 100 times more protons than a solution with a pH of 9.