The aim of this experiment is to deduce the oxidation state of manganese in several reactions according to the color change of the solution.

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Experiment #13 SL

December, 5/2002

Redox reactions

AIM:

The aim of this experiment is to deduce the oxidation state of manganese in several reactions according to the color change of the solution.

INTRODUCTION:

Manganese is a transition metal that exhibits several different oxidation states. Each oxidation state is characterized by a different color. Thus the presence of manganese in a particular oxidation state may be deduced by the color of the substance observed.

So, the colors that will appear in each one of the magnesium's oxidation states will be as in the following table:

OXIDATION STATE

COLOR

Mn (II)

Transparent, slight trace of pink

Mn (III)

Unstable brown

Mn(IV)

Black/brown

Mn(VI)

Green

Mn (VII)

purple

HYPOTHESIS:

Changing the oxidation state of magnesium contained in a solution, the color of the solution will change as well.

MATERIAL AND EQUIPMENT:

50ml beaker

200ml conical flask

3ml pipette

Test tubes

1M HCl

3M NaOH

0.05M KMnO4

0.1M Na2SO3

METHOD:

We first prepare 500ml solutions of the following substances: 1M