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Organic Chemistry Laboratory Notebook Maintenance

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Organic Chemistry Laboratory Notebook Maintenance Before coming to class Complete PRE-LAB assignment section of laboratory notebook. Remember, without a COMPLETE ... – PowerPoint PPT presentation

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Title: Organic Chemistry Laboratory Notebook Maintenance


1
Organic Chemistry Laboratory Notebook Maintenance
2
Before coming to class
  • Complete PRE-LAB assignment section of laboratory
    notebook.
  • Remember, without a COMPLETE PRE-LAB assignment,
    you will not be allowed to do experiment!

3
Step 1 Complete Information at top of page
Experiment title and number
Date
1. Structure, Intermolecular Forces, and
Solubility
8/8/12
Name
Course
Section
Lab partner
Jane Doe
231
M 11
Joe Doe
Give lab day and time here
4
Step 2 Objectives
  • Always include a header.
  • Give brief description of what you are attempting
    to do and how you are going to do it.

OBJECTIVE To investigate the relationship
between molecular structure, intermolecular
forces and solubility of various organic and
aqueous solvents using solubility testing.
5
Step 3 Chemical Reaction and Reaction Table
  • CH3CH2CH2CH2OH NaBr H? CH3CH2CH2CH2Br H2O
  • Do not write mechanism here
  • Some experiments do not call for the preparation
    of a compound. In those cases, you can skip to
    the next section.

Chemical Name 1-butanol Sodium bromide 1-bromobutane
Molecular weight 74.12 mg/ mmol 102.894 mg/mmol 137.03 mg/ mmol
Mass 0.567 g 1.0 g 1.05 g
mmol 7.65 mmol 9.72 mmol 7.65 mmol
Equivalents 1 1.27 1
Density 0.81 g/ml   1.27 g/ml
volume 0.7 mL   0.827 mL
6
Step 4 Table of Physical Data
  • Prepare a single, organized table including
    physical constants and hazards for all chemicals
    in list as instructed.
  • Physical data is available from MSDS sheets!
  • WIKIPEDIA IS NOT AN ACCEPTABLE SOURCE!

7
Step 4 Finding Physical Data
  • Can use one of two sites
  • http//hazard.com/msds
  • http//www.chemexper.com/

8
Step 5 Separation Scheme
  • Show, by means of a flow chart, how the desired
    product is to be separated from the reaction
    mixture (i.e. solvents, excess starting
    materials, and unwanted side products).
  • Be specific, but not overly detailed
  • Some experiments do not call for the separation
    or purification of a compound. In those cases,
    you can skip to the next section

9
Step 5 Separation Scheme
10
Step 6 Procedure
  • Write a concise version of the experimental
    procedure in your lab book (summarize)
  • Include sketches and label parts of any apparatus
    that is being used for the first time.
  • Do not spend too much time here.

11
Step 7 Day of lab
  • Your instructor will initial the pre-lab portion
    of your lab notebook prior to the lab briefing.
  • Without a COMPLETE pre-lab, you will NOT be
    allowed to perform the experiment.

12
Step 8 During the lab
  • write down any relevant observations that you
    make and any changes to the published material.
  • Write information down in blue or black ink
    directly in notebook as you do it, not after you
    leave the room!

13
Step 8 Example
Data and Observations wt of salicylic acid
paper 2.43 g wt of paper 0.43 g salicylic acid
2.00 g 1) On mixing, it took a few minutes for
everything to go into solution. The addition of
sulfuric acid caused some fizzing. 2) Heated for
about 15 min instead of the planned 10 min. 3)
After adding the water and cooling, no crystals
appeared. On the suggestion of my Instructor, I
scratched the flask with a glass rod, chilled it
on ice for 10 more min, and finally a lot of
slightly tan crystals appeared. 4) Quite a lot of
solid, lightly tan, was collected on the filter
paper 5) Let dry for 10 min. crude product
watchglass 32.02 g watchglass 30.10 g crude
product 1.92 g yield of crude pr oduct 1.92
g/2.52 g 76
14
Step 8 After the lab
  • Remove the YELLOW lab notebook pages containing
    all pre-lab and in-lab entries for the experiment
    and attach them to your FINAL LAB REPORT for
    grading.
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