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O-13
2.
Using the Chemistry Data Sheet, explain why sulfuric acid should not be used in the preparation
of the KMnO
4
solution that is to be standardized. Include appropriate redox equations. (1.0
mark)
3.
After having attained the expected pink endpoint in a permanganate titration, a student observes
that the solution changes color, depositing a brown solid in the titration flask. Using the Chemistry
Data Sheet, explain what has occurred. Include appropriate redox equations. (1.0 mark)
4.
If you repeated the same titration, only substituting sulfuric acid with hydrobromic acid, (HBr), in
Part II of the experiment, you will find that the concentration of the hydrogen peroxide determined
is inaccurate compared to the results obtained using only sulfuric acid. Account for this
observation, including the appropriate redox equations and overall standard potential. (0.8 mark)
