The document describes an experiment to investigate how different solutions (acidic, neutral, basic) affect the reduction of manganese. Students are instructed to add a potassium permanganate solution to beakers containing acidic, neutral, and basic solutions of sodium hydrosulfite and observe the resulting reactions. They are asked to record initial and final pH measurements, concentrations of aqueous species, colors, and any solid materials produced. The results show that an acidic solution produces a pink color and manganese(II) ions, a neutral solution remains colorless and produces manganese dioxide, and a basic solution turns green and produces less manganese dioxide. Students are then asked to write a formal lab report following the proper scientific format and style to communicate

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SCH4U h5, Chemistry, 12, University - Virtual High School (VHS)
Unit Assignment: Oxidizing and Reducing Agents Lab
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Experiment
Question
How will different solutions (acid, neutral, basic) affect the reduction of Mn?
Instructions for Oxidation States of Manganese Lab
Assemble your materials on the workbench:
 Bottle containing KMnO4
 Flask containing 10 M of H2SO3
 Flask containing 10 M of NaOH
 4 x 600 ml beakers
 Carboy of ddH2O

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Procedure
1. In a 600 ml beaker, create an aqueous solution of 0.01 M KMnO (be sure to explain how this is done and
show your calculations in the materials and methods section). Right click on the beaker and select rename.
Rename it “0.01 M KMnO4”.
2. To one of the beakers, add 100 ml of 10 M H2SO3 and 100 ml of 10 M NaHSO3. Note the pH. Label this
beaker “acidified”
3. To another beaker, add 200 ml of 10 M NaHSO3 (use two of the flasks). Label this beaker “control”. Note
the pH .
4. To the third beaker, add 100 ml of 10 M NaOH and 100 ml of 10 M NaHSO3. Note the pH. Label this beaker
“basified”.
5. Add 100 ml of 0.01 M KMnO4 to each of the three beakers.
6. Make any observations that are relevant-- qualitative and quantitative. Remember to use the panel to the
side for aqueous species data, and remember to click on “solid” and note the mass of any solid species that
may have evolved.

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Oxidizing and Reducing
Agents Lab Assignment
Once you have completed your
test(s), communicate your results in a
lab report.
Refer to the "Writing a Lab Report"
page of the Scientific Skills and
Formatting module to ensure that you
follow the proper format
Acidified Control Basified
pHInitial -0.70 3.09 10.94
H+ Concentration Initial 5.000 8.105 x 10-4 1.152 x 10-11
OH- Concentration
Initial
2.019 x 10-15 1.246 x 10-11 8.765 x 10-4
Color Initial White White White
pHfinal -0.52 3.00 10.70
H+ Concentration final 3.330 9.921 x 10-4 1.975 x 10-11
OH- Concentration final ~0 1.106 x 10-11 5.113 x 10-4
Color final Pink White Green
Solid species created 0.0873g of MnO2 0.0873g of MnO2 0.0373g of MnO2
Concentration Mn2+ 7.609 x 10-8 1.173 x 10-10 3.758 x 10-17
Concentration MnO4
2- 1.730 x 10-10 9.691 x 10-11 1.918 x 10-3
Concentration MnO4
- 7.231 x 10-13 1.060 x 10-15 ~0
Concentration MnO2 0.003M 0.003M 0.0014M
Observations

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Note on Writing In Science
All information and relevant data are to be included in a logically sequenced
manner. In your writing, it is important to use appropriate writing style, tone, and
scientific terminology. Conduct your research using reliable, peer reviewed and
industry sources and ensure that sources listed in your reference list are directly
related to information presented in your paper. Use the appropriate referencing
style for science to cite your sources. For more information, see the page titled
“References” in the Scientific Skills and Formatting module of the Introduction unit
in your course.