CHEM 30AL Summer 2002 Pre-lab Report Guidelines for Aspirin Experiment (Week 2 ONLY) Prelab is due at the BEGINNING of the lab section. Prelab report MUST be written inside your LAB NOTEBOOK. NO EXCEPTION! (i) Title (ii) Reference of procedures (iii) Introduction (iv) Procedures (flow chart) (see p92-93 under week 2) Your flowchart only need to include procedures UP to the "Melting point of Aspirin" (see page 93) (v) MSDS information The following chemicals will require you to use the MSDS database on the Web (refer to the MSDS handout): Aspirin; NaOH (around 0.2 to 0.5M) 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 ONLY problems 1-3 under week 2 on p.91. (vii) Data/observations (start a new page for this section) 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 30AL Summer 2002 Postlab Report Guidelines for Aspirin Experiment (Part 2) This is an INDIVIDUAL report Post-lab report MUST be written inside your LAB NOTEBOOK (except for graphs). (A) Abstract - summarize results and outline the lab technique that you used in the lab to purify and analyze the final product. (B) Titration Data (see p.94 under Analyses) - Orderly record of data - Data tables should have proper titles/labels (C) Data Analysis (MUST SHOW ALL WORK FOR FULL CREDIT) - % Recrystallized yield - % Purity (D) Error Analysis (MUST SHOW ALL WORK FOR FULL CREDIT) NOTE: Refer to chemistry 20L lecture notes on errors propagation or your post-lab for part 2 of the iron-oxalate lab. - Calculate the % inherent error in % purity for ONE of your trials. You Must identify each term in the error analysis. (E) Conclusions - summarize results (again) - Based on the value of the experimental melting point, what can you conclude in terms of the purity of the product? Explain. - If your % purity is greater than 100%, explain why. - If your % purity is less than 50%, explain
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