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How to approach a lab write up for EXP 18
Name
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.
(5 points)
Procedure: Write a step by step procedure of the experiment as outlined in the video. (5points)
Results and calculations: Report results from experiment. Tables can be used, also show sample calculations. (20 points total)
Fermentation of Sucrose
Measuring Sucrose (3pts)
Mass of weight boat
Mass of weight boat +Sucrose
Mass of sucrose
Measuring yeast (3pts)
Mass of weight boat
Mass of weight boat + yeast
Mass of yeast
Fractional distillation (3pts)
Mass of empty vial
Mass of vial + distillate
Mass of distillate
Measuring Density of distillate at 25°C (3pts)
Mass of empty vial
Mass of empty vial and 1.000 mL of distillate
Mass of 1.000 mL of distillate
Density of distillate (2pts)
Percent ethanol by weight (2pts)
% Yield of ethanol = (mass of ethanol/theoretical yield) * 100 (4pts)
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: (2 points)
Post lab calculations: (pg. 156)
Questions (1 and 6) (5 points)
For question 6, at room temperature and pressure (1 atm and 25 °C) one mole of a gas occupies 24 Liters.
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