Lab Guidelines Exp. #4C

CHEM 14BL Winter 2002
Report Guidelines for Week 3 of the Aspirin Experiment (4c).
Pre-lab Guidelines (Week 3 ONLY)
Note: We will not do part 2 of this experiment
(i) Title
(ii) Reference
(iii) Introduction
(iv) Procedures (flow chart) (see 58 under week 3)
(v) MSDS information
The following chemicals will require you to use the MSDS database on the Web (see Lecture
Syllabus):
FeCl3
Note: In MSDS, select the site that gives you the MSDS information closest to the
concentration or grade listed above for each individual chemical.
You should record the following MSDS information in your notebook for the chemicals listed
above.
(Printouts directly from the Web pages will NOT be accepted!!)
(a) Product Name
(b) Chemical Formula
(c) Formula Weight
(d) Melting Point; Boiling Point and Density
(e) Health Hazard Data (summarize in your own words)
(f) Spill and Disposal procedures (summarize in your own words)
(vi) Prelab study questions (Must show all work for FULL credit)
Complete ALL problems under week 3 on p.56.
(vii) Data/observations
Set up tables but leave blank. You MUST record all the observations into your lab notebook
during your lab sessions. You will NOT receive any credit for your lab technique if you only
record the weight of the chemicals for this experiment.

CHEM 14BL Winter 2002
Postlab Report Guidelines for Experiment 4c (Aspirin Analysis)
This is a GROUP Report
(i.e. TURN IN ONLY ONE REPORT PER GROUP)
(A) Data
- Write the names of your group members and their responsibility in the experiment and in writing
this postlab report
- Orderly record of data AND observations
- EXPERIMENTAL melting point of EACH INDIVIDUAL GROUP MEMBER
- Data tables should have proper titles/labels
(B) Graph
- Beer's law plot of concentration vs. absorbance for the standard solutions
Your graph must have proper title, labels. Data points must be clearly marked.
Make sure you use the correct type of graph paper. If you use EXCEL, make sure that the gridlines are set
properly.
(C) Data Analysis (MUST SHOW ALL WORK FOR FULL CREDIT)
- slope of the line (with proper unit)
(indicate which two points on the line you use for calculating the slope).
- concentrations for all the standard solutions
- concentration of salicylic acid in the aspirin sample (with proper unit)
- % purity
(D) Error Analysis (MUST SHOW ALL WORK FOR FULL CREDIT)
(Refer to the lecture guide for details on error analysis)
You may assume the absolute error in the 1.00-mL syringe to be ± 0.1ml
- error in concentration (i.e. range of concentration) for ONE of your standard solution
(all terms identified and error bar placed on graph)
- error in absorbance (i.e. range of absorbance) for ONE of your standard solution
(all terms identified and error bar placed on graph)
- calculate the range of slopes of standard line. You MUST show mathematically how you obtain
those slopes (i.e. max. slope and min. slope must be labeled clearly on your graph)
- error in absorbance of your experimental aspirin solution
- error in concentration of your experimental aspirin solution
- estimate the inherent error in your experimental aspirin solution
(E) Conclusions
- Summarize results and comment on % aspirin in your sample.

- Compare the melting point of aspirin from the literature with the melting point range that you
observed in the lab. Is your product pure based on the melting point range that you observed?
What can you conclude? (pick the BEST melting point to answer the questions for this part)
Make sure you turn in the mass spectrum post-lab (refer to the mass
spectroscopy post-lab handout) with this report.