Oxidation Numbers and Ion Charges

The video tutorial explains how to determine the oxidation number of manganese in the MnO4- ion. It begins by setting up an equation using known oxidation numbers, such as oxygen's -2. The unknown oxidation number of manganese is represented as 'x'. By solving the equation, it is determined that manganese has an oxidation number of +7 in the MnO4- ion. The tutorial concludes with a brief wrap-up and thanks from Dr. B.

What is the overall charge of the manganate ion, MnO4-?

• -1

• 0

• -2

• +1

What is the typical oxidation number of oxygen in compounds?

• -2

• +2

• -1

• +1

In the equation x + 4(-2) = -1, what does 'x' represent?

• The number of oxygen atoms

• The overall charge of the ion

• The oxidation number of manganese

• The oxidation number of oxygen

How do you solve for 'x' in the equation x + 4(-2) = -1?

• Multiply both sides by 4

• Add 8 to both sides

• Subtract 8 from both sides

• Divide both sides by 4

What is the oxidation number of manganese in the MnO4- ion?

• +8

• +5

• +7

• +6