posted by nan .
A solution with pH = 4 has
1. relatively high concentration of OH-
2. relatively low concentration of H3O+
3. relatively high concentration of H3O+
4. zero concentration of OH-
pH = 4 has (H^+) = 1E-4.
Then (H^+)(OH^-) = 1E-14
So if (H^+) = 1E-4, then (OH^-) must be 1E-10.
I am still lost? What is the answer 1, 2, 3 or 4?
If I told you that (H^+) = (OH^-) = 1E-7M in pure water, and that in this solution H^+ = 1E-4 and OH^- = 1E-10, then how would you classify (H^+) and (OH^-); i.e., are they relatively large or relatively small.