RECRYSTALIZING IMPURE SOLIDS: MINISCALE PROCEDURES
PLEASE TYPE A FORMAL CHEMISTRY LAB REPORT. RUBRIC IS ATTACHED TO THIS POST
PLEASE READ CAREFULLY & THOROUGHLY THROUGH EACH STEP. THE PROCEDURE IS ATTACHED TO THIS POST TOO.
Lab Manual: Experimental Organic Chemistry: A Miniscale and Microscale Approach, Sixth Edition, John C. Gilbert and Stephen F. Martin, 2016, Cengage Learning. Boston. ISBN: 978-1-305-08046-1
LAB REPORT MUST INCLUDE (TYPED IN A WORD DOCUMENT):
Calculations show all your work to receive full credit.
Results and Discussion (typed) – Explain your results, referring to chemistry theory where appropriate. Did the data conform to what was expected? (This does not mean the same thing as if the experiment was successful or not!) What does it show in relation to the experiment? If the results are not what was expected explain why. Possible sources of error.
Conclusion (typed) – briefly restate any final results, or conclusions that can be drawn from the experiment.
References (typed) – any sources consulted for the writing of the report.
EMPTY PLATE: 0.0001g
EMPTY PLATE + BENZOIC ACID: 0.0027g
EMPTY PLATE: 0.0001g
EMPTY PLATE + ACETANILIDE : 0.0447g
How to approach a lab write up for EXP 23A
Date (of experiment)
Title of experiment: (as listed in manual/handout)
Purpose or Aim: This says exactly what the goal of the experiment is. It may consist of one or more parts. Based on what is stated in the procedure, you should have a very good idea as to what the point of the experiment is. Explicitly and briefly state all in this section. (3 points)
Examples: 1. To recrystallize an impure sample of benzoic acid; 2. To determine the melting point of salicylic acid
Introduction: This explains the theory behind the experiment. Give some general background as to what the experiment is about. Include definitions of any key concepts that are an important part of the experiment. (5 points)
This approach can be applied across all topics being covered.
Materials: List glassware, chemicals and equipment/instrumentation used in the experiment.
Results and calculations: Report results from experiment. Tables can be used, also show sample calculations. (10 points)
Mass of 25 mL Rb Flask
Mass of 25 mL Rb Flask + n-butyl alcohol
Mass of n-butyl alcohol (1pt)
Mass of weight boat
Mass of weight boat + NaBr
Mass of NaBr (1pt)
Mass of conical flask
Mass of conical flask + product
Mass of n-butyl bromide (1pt)
Theoretical yield of n-butyl bromide (4pts)
% yield of n-butyl bromide (3pts)
Discussion: Analyze the data you obtained in your experiment. Explain difference between the starting weight of the impure sulfanilamide and the pure sulfanilamide. (5 points)
Conclusion: (3 points)
Questions (1-6 pg 206) ( 14 points)