CHEM 30AL Fall 2004 Pre lab Report Guidelines for Aspirin Experiment Week 2 ONLY Pre lab is due at the BEGINNING of the lab section Pre lab report MUST be written inside your LAB NOTEBOOK NO EXCEPTION i ii iii iv Title Reference of procedures Introduction 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 between 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 b c d e f Product Name Chemical Formula Formula Weight Melting Point Boiling Point and Density Health Hazard Data summarize in your own words Spill and Disposal procedures summarize in your own words vi Pre lab 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 Fall 2004 Post lab 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 Calculate the recrystallized yield Calculate the average purity from all the trials of your titrations Calculate the Rf values for the recrystallized aspirin product salicylic acid and the pure aspirin for the TLC experiment D Error Analysis MUST SHOW ALL WORK FOR FULL CREDIT NOTE Refer to chemistry 20L lecture notes on errors propagation or your post lab report 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 result of TLC comment on the purity of the aspirin product Based on the value of the experimental melting point as compare to literature value 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 why Note Attach the ORIGINAL experimental TLC plate with your post lab report
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