report worksheet experiment 1 - Department of Chemistry...

Department of Chemistry & Biochemistry, University of California, San Diego
Course Instructor: Dr. S. Berniolles Page 1
CHEM 6BL EXPERIMENT 1 LAB
REPORT WORKSHEET
Gravimetric Analysis
Author: ______________________
Date: ________________________________________________
TA Name/Lab Section No.: _______________________________
TA/Grader Only :
Graded Components Student Score
Prelab Procedure (graded by TA) /5
Prelab Quiz (graded by TA) /5
Accuracy /10
Abstract /5
Introduction /20
Results /35
Discussion /20
TOTAL SCORE (Max. 100 pts) /100

Department of Chemistry & Biochemistry, University of California, San Diego
Course Instructor: Dr. S. Berniolles Page 2
LAB REPORT CHECKLIST
Follow the instructions provided to fill out this worksheet in non-erasable black/blue ink
Attach the introduction section (copy pages of lab notebook. Two pages maximum )
Attach the discussion section (copy pages of lab notebook. Two pages maximum )
Note : Specific instructions on what to include and how to write a lab report are available in
the “Laboratory Notebook and Laboratory Report Writing Guidelines” section included in
the CHEM 6BL Online Lab Manual Introduction. Supplemental educational materials may
also be available on WebCT. Do not hesitate to consult your TA and/or instructor if you
have any questions.
ACCURACY (10 points)
Unknown #: ________ Average [Al
3+
] = __________________ mmol/mL
ABSTRACT (5 points)
In this experiment, gravimetric analysis via precipitation chemistry was used to determine
the Al
3+
concentration in an unknown solution ( Unknown #: _________ ). The concentration
of the unknown Al
3+
solution proved to be:
Average [Al
3+
] ± 2 σ = ___________________ mmol/mL ± ____________ mmol/mL.
[e.g., 0.01000 mmol/mL ± 0.00011 mmol/mL]
INTRODUCTION (20 points)
Write your introduction by hand in your lab notebook.
EXPERIMENTAL (0 points- Not required)
Note : This section has been pre-written for you and can serve as an example when you have
to write the experimental section of your next lab report (note the tense used, etc.).
Three filtering ceramic crucibles were cleaned and dried. After cleaning and before
drying, the three crucibles were individually labeled before any further use. Each crucible
was weighed with filter paper once before drying. The crucibles (with filter paper) were dried
in an oven (at >100°C) for at least 20 minutes and then allowed to cool for at least 45 minutes