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Inorganic Chemistry |
Experiment 5 |
Spring 2024 |
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 29, 2024 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