Oxidation States and Hydroxide Ions

The video tutorial explains the oxidation numbers for copper(II) hydroxide, Cu(OH)2. It begins by introducing the compound and its neutral nature, where the sum of oxidation numbers equals zero. The hydroxide ion is identified as a polyatomic ion with a charge of -1. The video then calculates the oxidation numbers for copper, oxygen, and hydrogen in the compound, highlighting that copper is +2, oxygen is -2, and hydrogen is +1. The tutorial concludes with a summary of these findings.

What is the overall charge of Copper(II) Hydroxide?

• Neutral

• Negative

• Variable

• Positive

What is the charge of a hydroxide ion?

• 0

• +1

• +2

• -1

How many hydroxide ions are present in Copper(II) Hydroxide?

• Four

• Two

• Three

• One

What is the oxidation state of copper in Copper(II) Hydroxide?

• +2

• -2

• 0

• +1

What is the typical oxidation number of oxygen in compounds?

• -1

• +2

• 0

• -2

When hydrogen is bonded to non-metals, what is its usual oxidation number?

• -1

• 0

• +2

• +1

Which element in Copper(II) Hydroxide has an oxidation number of +2?

• Oxygen

• Hydrogen

• Copper

• None