Organic Chemistry Semester 1 LABORATORY MANUAL - Moravian ...

Part V. Experiments 26 Fall 2010
H
H
N
O
O
N
O
Solutes
H
H
Experiment 3
Part B
How Does the
pH of Aqueous
Solutions Affect
the Solubilities
of Organic
Compounds
H 3 O + Cl -
Na + - OH
H 2 O
Solvents
A. Pre-lab Preparation Assignment:
1. Read: -This document and Appendix A of the CHEM 211 Lab Manual.
2. Complete work on Part A including IN-Lab and POST-Lab questions. (See website
Experiment 1 Part A page)
3. Complete the electronic Prelab Questions (course website) and submit your answers by
8:00 PM Sunday, September 26 on the Course Blackboard Site as explained on the
Course Information page.
4. Consider possible claims and warrants for the QOW (See below)
5. In your laboratory notebook: (See Lab Manual pp. 15-17 for format.)
a. Enter the title of Part B (as a new experiment), name of group members and QOW on
the appropriate first left-hand page.
b. Up-date the Table of Contents.
6. Bring your notebook and your initial claims and warrants concerning the QOW to the
AM lab discussion period on Monday, September 27.
B. Safety Matters:
1. Safety goggles are required.
2. Shoes must cover the tops of your feet.
3. Avoid skin contact with acidic and basic solutions and wash your hands periodically
during the laboratory period.
C. Introduction:
In Part A, we explored the relationships between solute molecular structure and pH effects on
solubility in water. This week we explore how solubility in acidic and basic solution can be
used to separate mixtures of compounds.
D. Question of the Week:
How can we use pH effects on solubility to separate mixtures of
compounds
E. Objectives:
1. To develop separation methods based on differences in solute solubilities in acid and/or
basic aqueous solutions.
2. To successfully separate a mixture of two compounds and isolate both components of the
mixture.
F. Key Terms/concepts/techniques:
• Miscibility
• Extraction
• Trituation
•