Inorganic Chemistry 

 Experiment 5

Spring 2018

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 Thermal Gravimetric Analysis of Hydrates

    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 four.  Each student group will run a known compound (CuSO4.5H2O). A TGA plot of an unknown sample with 'x' waters of hydration will be given to each group.  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 16, 2018 by 5:00 pm. No late reports will be accepted.

Possible unknowns for the TGA experiment:

ZnSO4.7 H2ODescription: Description: Description: C:\Users\mdraganj\Documents\draganjac_files\TGA.jpg
Na2MoO4.2 H2O
MgSO4.7 H2O
CaCl2.2 H2O
CuSO4.5 H2O
FeSO4.7 H2O
FeSO4.5 H2O
CoNO3.5 H2O
RuCl3.3 H2O
Na2SO4.10 H2O
Na3PO4.10 H2O
Na2SeO4.10 H2O

CHEM4204 Experiment list