Answer to Question #303890 in General Chemistry for cornnnfrogeuu

Question

A research chemist adds a measured amount of HBr gas to pure water at 25^oC and obtains a solution with [H₃O⁺] = 8.3x10^-4 M. Calculate [OH^-]. Is the solution acidic, basic, or neutral? 

Answer 1

[H₂O] = [H₃O⁺][OH^-]

10^-14 = 8.3x10^-4 M x [OH^-]

[OH^-] = 10^-14 / 8.3x10^-4 = 1.2 x 10^-11 M

[H₃O⁺] < 10^-7 - acidic