Module 7 Intro

Module 7—Chemical Analysis

In This Module

Lesson 1—Limiting Reagents

The focus of this lesson is to learn how to apply your knowledge of stoichiometry to determine which reactant will be the first to deplete during a chemical reaction. Understanding the calculations used to determine the limiting reagent can be applied to a variety of situations, including specifying the quantities of reactants that should be used in a laboratory procedure that you design and determining the necessary quantities of chemicals used in a life-support system for a spacecraft.

• How can limiting reagents be used to predict the amount of product for a chemical process?

Lesson 2—Titration Analysis

In this lesson you will learn about titration, which is a process used to determine the quantity of substance in a test sample. Although many methods can be used to determine quantity, titration is one of the most reliable and easily performed experimental procedures. You will see how your knowledge of stoichiometry can be used to analyze the data collected during a titration experiment. In addition, you will see how titration can be used to study an acid-base chemical system and other chemical systems.

• How can titration be used to calculate the quantity of solute within a solution?

Lesson 3—Titration Curves and Selecting Indicators

In Lesson 2 you performed a titration. In this lesson you will construct a graph depicting the changes in concentration of key components in a chemical reaction. This graph is called a titration curve. You will also interpret a titration curve and identify aspects of this graph that demonstrate significant features of the chemical reaction.

In Module 5 you used indicators to determine the pH of a solution, and in Lesson 2 you used an indicator to identify the endpoint of a titration reaction. In this lesson you will learn how to use your titration curve to select appropriate indicators for a titration, allowing for precise and sensitive detection of the completion of a chemical reaction.

• How are titration graphs drawn?
• How do you select an appropriate indicator for a titration?
  

Module Assessment

The assessment in this module consists of three lesson assignments and a module project (Parts 1, 2, and 3).

• Module 7: Lesson 1 Assignment
• Module 7: Lesson 2 Assignment
• Module 7: Lesson 3 Assignment
• Module Project (Part 1)—Using Stoichiometry to Save the Apollo 13 Astronauts
  
• Module Project (Part 2)—The Nature of Scientific Research and Apollo 13
  
• Module Project (Part 3)—Analytic Measurement Technology