The TGA experiment typically requires about a three hour time period to run the sample and work up the results.  The TGA system at Arkansas State University (Seiko TG/DTA 320) can simultaneously collect mass loss data and the thermicity of the sample. Students will work in groups of three.  Each student group will be given an unknown with x number of hydrates.  Based on the % mass loss, you are to identify your unknown from a list of possible compounds (see below). Discuss the thermicity of the unknown.  Each student must submit their own lab report.  If duplication occurs on the lab reports, all students with duplicate reports will receive a fraction of the average grade for the group.  The write up should include a brief introduction, a table of the percent water in each unknown and a results and discussion section, identifying the unknown hydrate.  Be sure to include the unknown number in your report. The thermogravimetric plot  must be included in the report for full credit.  The report must follow the guidelines on the Lab Report page.  This experiment is worth 20 lab points and will be due Friday, March 28, 2008 by 5:00 pm. No late reports will be accepted.
 

Possible unknowns for the TGA experiment:

ZnSO₄.7 H₂O
Na₂MoO₄.2 H₂O
MgSO₄.7 H₂O
CaCl₂.2 H₂O
CuSO₄.5 H₂O
FeSO₄.7 H₂O
NaH₂PO₄.H₂O
FeSO₄.5 H₂O
CoNO₃.5 H₂O
RuCl₃.3 H₂O
Na₂SO₄.10 H₂O
Na₃PO₄.10 H₂O
Na₂SeO₄.10 H₂O

CHEM4204 Experiment list