NCEA Level 3 Chemistry – Aqueous Chemistry (AS91393) Practice Exam 2025 - Free Chemistry Practice Questions and Study Guide

Volumetric analysis in titration is primarily used to determine the concentration of an unknown solution by measuring the volume of a titrant of known concentration needed to react completely with the substance in the unknown solution. During the titration process, the point at which the reactants are in stoichiometric proportions is typically indicated by a color change if an appropriate indicator is used. This quantitative relationship allows chemists to calculate the concentration of the unknown solution based on the known concentration of the titrant and the precise volume used.

In contrast, the other options do not align with the primary purpose of volumetric analysis. For example, measuring the heat produced in a reaction, the temperature at which a reaction occurs, or the size of particles in a suspension are all related to different types of chemical analyses and do not provide information about concentrations in the way titration does. Thus, the focus of volumetric analysis is specifically on concentration determination through the stoichiometry of the reactants in the titration process.