Experiment 2 Sample Quiz
1. The procedure calls for the addition of _____ spatula fulls of
zinc dust:
0
20
5
1
2. Analysis of Fe3+ requires _____ KMnO4 than the C2O42-
analysis.
much more.
less.
much less.
the same.
3. Mn2+ is a _______ complex:
colorless.
pink
deep purple.
blue
4. The molarity of the KMnO4 used in the analysis is ~____M.
2
1
0.01
0.02
0.1
5. The anticipated C2O42-:Fe3+ ratio for the analysis of your
coordination complex is:
1:3
1:2
3:1
2:1
1:1
6. The analysis uses _______ as the indicator:
sodium oxalate.
phenolphthalein.
zinc.
potassium permanganate
universal indicator.
7. The deep color of MnO4- is due to:
Mn
Mn7+
O2-
Mn2+
K+
8. The analysis of K3[Fe(C2O4)3]·3H2O is based on a series of:
neutralization reactions.
redox reactions.
gas forming reactions.
acid/base reactions.
precipitation reactions.
9. The excess zinc is removed by:
sublimation.
decant the solution.
gravity filtration.
vacuum filtration.
distillation.
10. The samples of K3[Fe(C2O4)3]·3H2O are dissolved in water
and:
heated gently to 80oC.
heated gently to 80oF.
heated gently to boiling.
cooled in ice to 0oC.
11. When titrating with potassium permanganate we usually
read:
the bottom of the meniscus.
the top of the meniscus.
the middle of the meniscus.
the side of the meniscus.
12. The pinkish/orange end point in the analysis of C2O42- is
due to:
Fe2+/MnO4-
MnO4-
Fe3+
Fe2+
Fe3+/MnO4-
13. Zinc dust is used in the experiment to:
reduce Fe2+ to Fe3+.
oxidize Fe3+ to Fe2+.
oxidize Fe2+ to Fe3+.
reduce Fe3+ to Fe2+.
14. When you have analyzed the sample for C2O42- you should:
save the solutions for further analysis.
discard the solutions in the waste container provided.
discard the solutions in the sink.
Evaluate
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3/22/23, 2:20 PM
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