A 25.0-mL sample of HBr is neutralized by reaction with 20.0 mL of 3.00 M KOH.What is the concentration of HBr in the unknown sample?

Question

Quizplus · Accepted Answer

The concentration of HBr can be found using the concept of molarity and the stoichiometry of the neutralization reaction. In a neutralization reaction, HBr reacts with KOH in a 1:1 molar ratio. The moles of KOH can be calculated as (volume in L) * (molarity) = 0.020 L * 3.00 M = 0.060 moles. Since the reaction is 1:1, the moles of HBr are also 0.060. The concentration of HBr is then (moles of HBr) / (volume of HBr in L) = 0.060 moles / 0.025 L = 2.4 M.

A 250-ML Sample of HBr Is Neutralized by Reaction with 20