Module 7 Intro

Module 7—Chemical Analysis

Lesson Summary

In this lesson you extended your knowledge of titrations by learning how to analyze titration curves. The data for a titration curve can be obtained by using a pH meter to record the pH while a sample is being titrated. One of the most important parts of a titration curve is the equivalence point, located at the midpoint of the steep middle region. The equivalence point signifies the completion of the reaction. The volume of titrant required to reach the equivalence point is used to complete calculations involved in quantitative analysis. The pH at the equivalence point is used to select an appropriate indicator for the titration. In Reflect and Connect, you applied your knowledge of titration analysis to determine the amount of ASA (acetylsalicylic acid) present in a tablet of Aspirin.

Lesson Glossary

titration curve: a graph of the change in pH of the system being studied as standardized solution is added