Module 5 Intro
1. Module 5 Intro
1.7. Lab
Module 5—Acids and Bases
Module 5: Lesson 1 Assignment
The following lab will be used to complete part of your Module 5: Lesson 1 Assignment. Retrieve the copy of the Module 5: Lesson 1 Assignment that you saved earlier. Later you will be asked to complete part of it.
Lab: Testing Arrhenius’s Acid-Base Definitions
Read the description for this lab on page 260 of your textbook.
Purpose
You will test Arrhenius’s definitions of an acid and a base.
Pre-lab Questions
1. Identify the two ions of interest in this investigation.
2. Describe how the theoretical concepts of dissociation and ionization are important to the ability to classify solutions as acidic, basic, or neutral based on the information you will collect during the laboratory.
Pre-Lab Answers
1. H+(aq) and OH−(aq)
2. The concepts of dissociation and of ionization are the mechanisms by which H+(aq) and OH−(aq) are produced and can be present in aqueous solutions.
In solutions where the concentration of H+(aq) is greater than the concentration of OH−(aq), it will have properties consistent with an acid.
In solutions where the concentration of H+(aq) is less than the concentration of OH−(aq), it will have properties consistent with a base.
In solutions where the concentration of H+(aq) is equal to the concentration of OH−(aq), it will have properties consistent with a neutral solution.
Procedure
Step 1: Prepare an experimental design that includes relevant diagnostic tests that could be used to differentiate solutions and classify them as acidic, basic, or neutral. Make sure your design identifies relevant variables and controls.
Step 2: Construct a suitable data table to record and present your observations as determined by your experimental design.
Step 3: Have your experimental design checked by your teacher. Follow instructions provided by your teacher for submitting this component of your work.
Step 4: If you have access to a laboratory and apparatus, perform your experiment and collect all the necessary data.
If you do not have access to a laboratory, view the ”Testing Aqueous Solutions” slideshow and the “Testing Aqueous Solutions: Controls” slideshow.
Analysis
Complete the Analysis questions in Part 2 of the Lesson 1 Assignment. Save your work to your course folder.