Posted by nan on Saturday, October 22, 2011 at 7:26pm.
pH 4 is a weak acid, so there will be a relatively high concentration of H20 and H+ which makes H3O+. Therefore, there can't be a high concentration of OH-, but that concentration IS NOT 0, because the pH is not very low.
Let me correct you Nan. You may just need to know which answer to choose; however, we try to give you the how without giving the answer. I gave you the HOW to work the problem, I did not give you the answer.
For Aaron, pH = 4 is NOT necessarily a weak acid. A pH = 4 means the H^+ = 1E-4M. A weak acid means the acid is ionized less than 100% so a pH of 4 could be realized by either a weak acid or a strong acid.
For both, I'll repeat that
(H^+)(OH^-) = 1E-14
So if (H^+) = 1E-4, then (OH^-) must be 1E-10.
The problem may not be the best worded in the world since "relatively" is not defined. I agree with Aaron that it can't be answer 4.
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