1. Module 7

1.9. Page 3

Lesson 2

Module 7—Principles of Chemical Equilibrium

Module 7: Lesson 2 Lab—Evidence of Reverse Reaction

 

Purpose

 

In your chemistry study to date, you have studied reactions that are quantitative. What does a quantitative reaction mean? How does the term quantitative connect with what you are learning about equilibrium? In this virtual investigation, you will observe the results of tests performed on a chemical system to learn more about equilibrium.


As you read the experimental design, you may wish to write out the chemical reactions involved and determine what substance is being tested for using Ba(NO3)2(aq). Contact your teacher if you are having difficulty.

 

Problem

 

Can the products of the reverse reaction be detected in a chemical system at equilibrium?

 

Experimental Design

 

Four different volumes (25 mL, 50 mL, 75 mL, and 100 mL) of 0.50 mol/L CaCl2(aq) are added to four 50-mL aliquots of 0.50 mol/L Na2SO4(aq). Each system is filtered and the mass of precipitate produced is dried and measured. The filtrate from each system is tested with a saturated solution of Ba(NO3)2(aq).

 

Retrieve your copy of Module 7: Lesson 2 Assignment that you saved to your computer earlier in this lesson. Answer the Pre-Lab and Hypothesis questions. Record data in the Assignment document as you view the virtual investigation.

 

Watch and Listen icon View the virtual investigation “Lab—Evidence of Reverse Reaction.”

 

Analysis

 

assignment icon Module 7: Lesson 2 Assignment

 

You will complete the Analysis in your Assignment document. Complete the Module 7: Lesson 2 Assignment now. Save your completed Assignment in your course folder. You will receive information later in the lesson on when to submit your work to your teacher.