Answer to Question #108386 in Chemistry for andrew

Question

What is the pH of 1.65 x 10-4 M solution of HBr

Answer 1

Solution:

HBr is a strong acid in aqueous media therefore it ionizes 100%.

HBr + H₂O = H₃O⁺ + Br^-

or

HBr = H⁺ + Br^-

This means that

[H₃O⁺] = [H⁺] = [HBr] = 1.65*10^-4 M.

pH = −log[H₃O⁺] = −log[H⁺].

Therefore,

pH = −log[H₃O⁺] = −log[1.65*10^-4] = 3.78

pH = 3.78

Answer: 3.78 is the pH of 1.65*10^-4 M solution of HBr.