Oxidation Numbers and Hydroxide Ions

This video tutorial explains how to determine the oxidation numbers for iron in iron II hydroxide (Fe(OH)2). It begins by introducing the concept of oxidation numbers and the neutrality of the compound. The video then explains the hydroxide ion's charge and how to calculate the oxidation numbers for iron using two different methods: direct calculation and setting up an equation. The tutorial concludes with a confirmation of the oxidation number for iron as +2.

What is the overall charge of iron(II) hydroxide?

• Positive

• Negative

• Neutral

• Variable

What type of ion is hydroxide?

• Monatomic ion

• Polyatomic ion

• Anion

• Cation

What is the charge of the hydroxide ion?

• 2+

• 1-

• 1+

• 2-

How do the oxidation numbers of oxygen and hydrogen in hydroxide add up?

• To the charge of the compound

• To the charge of the ion

• To one

• To zero

What is the oxidation number of iron in iron(II) hydroxide using the charge balance method?

• +3

• +2

• +1

• 0

In the algebraic method, what is the oxidation number assigned to oxygen?

• +1

• 0

• -1

• -2

What is the oxidation number of hydrogen when bonded to non-metals?

• +1

• 0

• -1

• -2

What equation is set up to find the oxidation number of iron using the algebraic method?

• x - 2 = 0

• x + 2 = 0

• x - 1 = 0

• x + 1 = 0

What is the final oxidation number of iron in iron(II) hydroxide using both methods?

• +3

• +2

• 0

• +1

What is the significance of the oxidation number in compounds?

• It determines the color of the compound

• It shows the compound's solubility

• It helps in balancing chemical equations

• It indicates the physical state of the compound