How do you find the concentration of an aqueous HBr solution that has a pH of 4.25?
Hydrobromic acid(HBr) is a strong acid, therefore it completely ionizes in solution. This being said, HBr will produce H^+ ion in solution, therefore [H^+] = [H3O^+].
Use ph=-log[H3O^+] = 10^-4.25= 10^log[H3O^+] =
5.6 x10^-5 M = [H3O^+]