What is the pH of a 0.050 M HBr solution?

Question

Quizplus · Accepted Answer

HBr is a strong acid, so we can assume it will dissociate completely in aqueous solution. This means that we can use the concentration of H+ ions produced by the dissociation to find the pH of the solution. The dissociation of HBr is as follows:
HBr(aq) -> H+(aq) + Br-(aq)
The concentration of H+ ions is equal to the concentration of the original HBr solution, since HBr dissociates completely. Therefore, [H+] = 0.050 M. To find the pH, we use the definition of pH: pH = -log[H+]. Substituting in the concentration of H+ we just found, we get:
pH = -log(0.050)
pH = 1.30
Therefore, the answer is C) 1.30.

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