A chemist adds a chemical to pure water and there is a 100-fold increase in the concentration of hydrogen ions.What is the best approximation of the new pH value?
A)0
B)5
C)7
D)9
E)14

Question

Quizplus · Accepted Answer

The pH scale is logarithmic, meaning a 100-fold increase in hydrogen ion concentration decreases the pH by 2 units (since 10^2 = 100). Pure water has a pH of 7, so the new pH value would be approximately 5.

A Chemist Adds a Chemical to Pure Water and There