Lab Report Format Sheet

CHEM 211-2011
Experiment 7
Laboratory Report
How Can We
Tell if Two
Solid
Compounds
Are the Same
or Different
Laboratory Report: (See Lab Manual Part III. pp. 18-19)
This report will be submitted by the group that was formed in Experiment 7.
One report for the group
Title: How Can We Tell if Two Solid Compounds Are the Same or Different
The Questions of the Week: (See Lab Manual Part III. p. 19)
State the Questions of the Week: What measurements can allow us to distinguish one compound
from another [No initial claims needed]
Experimental Plan: (See also Lab Manual p. 19) – 50 words or less
A brief statement of the plan for Experiment 7, without the technical specifics, on the research
plans designed to answer each of them.
Summary of Results: (See Lab Manual Part III. pp. 18-19)
Data only: Tables, figures and/or plots, with no text explanations.
Include the following tables in the order that you discuss the data in your Discussion and
Conclusions section.
1. Prepare a table that compares data of the individuals you identified as members of your
"Solids Research Group" illustrating how the data indicate that all group members have the
same compound. Include results from all studies, including 3 major IR peaks. See sample
Table below.
GROUP:
Student
mp
(˚C)
CH 2 Cl 2
5%
methanol
in CH 2 Cl 2
TLC Rf's
10%
methanol
in CH 2 Cl 2
*15%
methanol
in
CH 2 Cl 2
It is
acidic
basic
neutral
most prominent IR peaks
(cm-1)
highest
ν
middle
ν
lowest
ν
Table 1: Group Data for Experiment 7 Unknowns
* This developing solvent was not used on Wednesday or Thursday, so they should delete the column for their
reports.
2. Prepare a table with your group’s mixture melting points together with side-by-side control
mp of one of the samples for each mixture. See sample Table below.
Side-by-side Side-by-side control
Student 1 Student 2
Mixture mp (˚C)
control sample mp (˚C)
Table 2: Group Mixture Melting Point Data

Formation of Solid Research Group 2 CHEM 211 Experiment 7
3. Prepare a table that compares your team’s data with that of the other “Solids Research Groups” in your
lab section. This table must include at least two key pieces of data from each of the other teams that
allowed you to conclude that their compound is different from yours. You need not fill in the whole
table, but include your data for each comparison. See sample Table below.
GROUP:
TLC Rf's
It is
most prominent IR peaks
(cm-1)
Group
mp
(˚C)
CH 2 Cl 2
5%
methanol
in CH 2 Cl 2
10%
methanol
in CH 2 Cl 2
15%
methanol
in CH 2 Cl 2
acidic
basic
neutral
highest
ν
middle
ν
lowest
ν
Your Group
Table 3: Data Excluding Non-group Members for Experiment 7
Claims, Warrants and Backing: (150 words or less)
Formation of Solids Research Group:
Provide proof that you have successfully formed your "Solids Research Group". Specifically cite data
from tables 1 & 2 that verifies that the samples of all members of your group are identical. Provide your
warrant illustrating how you analyzed the data to formulate your claim. If some of the data are
contradictory or equivocal, explain how they are outweighed by the preponderance of other data.
Then cite data from Table 3 that allowed you to specifically exclude all others in your lab section.
Provide your warrant illustrating how you analyzed the data to formulate your claim.
Reflection: (100 words or less))
This experiment allowed you to use techniques from earlier experiments and introduced infrared
spectroscopy as a new characterization technique. Look back on the process your group members used to
differentiate between those with the same compound and those with different compounds.
Then look back at the techniques used and evaluate which ones were the most useful in distinguishing
between different compounds and identifying identical compounds. If you now needed to determine
whether two solid compounds might be identical, which technique would you use first Would it be the
same if the compounds were liquids Provide a warrant for each claim.
Appendix: (See Lab Manual Part III. p. 20)
Include one set of handouts and all items in the Experiment 7 sections of each of your group members’
Data Binders.
Laboratory Report Due Date:
Your lab report for Experiment 7 is due in your lab period during the week of November 9-15.