Lab II: Part
1 of 3-Part Dual Unknown Lab
Laboratory Glassware, & The Laboratory Notebook:
First' Section & Mohrig--Techniques 1-3, pp. 1-33.
& Mohrig--Technique 10.1-10.3, & 10.6, pp. 116-123, 125.
& Mohrig--Technique 11.1-11.3, pp. 128-137.
This lab is a multi-week experiment using wet chemical
techniques and spectroscopic data to collect physical and chemical property
information about two unknowns, a solid and a liquid at room temperature.
Each unknown will contain one or more of the following major functional
ALDEHYDE, AMINE, CARBOXYLIC ACID, KETONE, NITRILE, PHENOL.
might also contain one of these other functional groups: alkene,
alkyne, amide, aromatic, ester, ether, halide, and nitro.
Throughout the semester you will work with your partner to discover the
physical properties and possible functional groups that make each unknown
unique. From this information, you should be able to identify your unknowns
from a list of possible compounds that will be given to you at the end
of the 3rd part of this lab (Week VII).
To collect preliminary classification
property information for
each unknown compound using the following techniques
Obtain the boiling point of the liquid unknown using simple
distillation and the melting point of the solid unknown using a Mel-Temp.
of these procedures can be found in the Appendix. It is important to
record the voltage or power level used when obtaining your melting point.
If the wrong voltage or power level is used, the recorded
melting point will be incorrect. (Mohrig, Figure 10.5, page 120)
a 1-2 sentence summary of today's work. Then, list everything you know
about your unknown solid and your unknown liquid.
Carefully prepare for the Week III lab.