Transcript Chem 211 Laboratory

VSEPR Experiment
CHEM 251
Week of November 8th, 2010
Alexis Patanarut
For the week of November 15th, 2010:
• Experiment: Potentiometric Titration of
Fe(II) with Ce(IV)
• Quiz: Material in the Handout
Purpose
• Today you will be using Lewis Dot diagrams, the ball and stick
models and the VSEPR theory to construct a series of molecules
(Part II in your lab manual)
ALxNy
– A
– L
– X
– N
– Y
Notation
- The Central Atom
- The Ligands (bonding pairs)
- The number of Ligands
- Non-bonding electron pairs
- The number of non-bonding electron pairs
• The geometric arrangement of each molecule you construct today
will be determined by taking the sum of X and Y
Procedure
1. Construct the six molecules on page 103 and
organize in your notebook with the following
information FOR EACH MOLECULE (make a
table):
1.
2.
3.
4.
5.
Molecule name
# of valence e- (show your work)
Lewis dot structure
X and Y (for ALxNy)
Angles (and axial and equatorial positions when
applicable)
6. Geometry
7. Observations on what you did today for the lab
Final notes
• Before you leave the lab today, make sure you
give me your carbon copies from your lab
notebook
• Use the protractors in your modeling kit to find
the bond angles
• No class data today! You are only responsible
for your own data