20P Question 9
Use the following information to answers questions A thru D.
Alex collected the following data in table 1 using the procedure from experiment 5. Answer the
following questions:
Mass of Crucible:
10.0859 g
Mass of Crucible + hydrate:
10.5859 g
Mass of Crucible + hydrate after heating #1:
10.37038
Mass of Crucible + hydrate after heating #2:
10.3335 g
Mass of Crucible + hydrate after heating #3:
10.3335 g
A. What is the percent H2O of the unknown hydrate from the experimental data?
B. If the true identity of the hydrate was sodium sulfate pentahydrate, what is the percent error in
the student's determination?
C. If your anhydrate (but not the hydrate) was hygroscopic (absorbs moisture). How would the
following affect the accuracy of your result: would it be higher than the true value or lower than
the true value? EXPLAIN YOUR REASONING.
D. If your sample 'popped when heating. How would the following affect the accuracy of your
result: would it be higher than the true value or lower than the true value? EXPLAIN YOUR
REASONING
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B