In the Colorful Oxidation States of Manganese Oxidation-Reduction Chemical Demonstration Kit, colorful manganese-containing solutions are produced by the oxidation states of manganese. Students will observe and balance redox reactions.
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Create a series of colorful solutions of manganese-containing ions and solids showing the various hues produced by the six oxidation states of manganese. Project the image of a 6-well plate filled with solutions of manganese(II) ions and manganese(VII) ions. By adding specific reactants to each well, the manganase oxidation state series of +2 through +7 is created, along with the corresponding color series of light pink (+2), rose (+3), dark brown (+4), blue (+5), green (+6), and purple (+7). Students make observations of the color changes and test their skill at balancing redox reactions. Includes Teacher Notes with helpful teaching tips, reproducible student worksheets, and enough materials to perform the demonstration seven times.
Concepts: Oxidation–reduction, oxidation state, half-reactions, oxidizing and reducing agents.
Time required: 15 minutes
Materials Provided: Potassium permanganate, manganese sulfate solution, sodium hydroxide, sodium sulfite, sulfuric acid, 6-well reaction plate, Beral-type pipets, toothpicks.
Correlation to Next Generation Science Standards (NGSS)
Science & Engineering Practices
Asking questions and defining problems
Developing and using models
Constructing explanations and designing solutions
Engaging in argument from evidence
Disciplinary Core Ideas
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions
Cause and effect
Systems and system models
Energy and matter
HS-PS1-1. Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.
HS-PS1-2. Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.
HS-PS1-7. Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.