Chapter 10, Problem 10.24P

Interpretation Introduction

Interpretation:

Indicators suitable for titration of pyridinium bromide with $\text{HBr}$ should be selected.

Concept Introduction:

Equivalence point, determined from titration curve, refers to the stoichiometric point that indicates the specific $\text{pH}$ when the concentration of base becomes same as the concentration of an acid or when all the analyte has been consumed by titrant.

In an acid base-kind of titration, progress of the reaction is quantified by neutralization of analyte when the definite volume of titrant is added. The indicators used are sensitive to $\text{pH}$ changes. Suitability of such an indicator is governed by their ability to detect endpoints accurately when the equivalence point is reached. Most suitable indicators have a transition range of $\text{pH}$ coincides with  $\text{pH}$ at equivalence point.