Ferrous Hydroxide and Hydroxide Ions

The video tutorial explains how to write the formula for ferrous hydroxide, also known as iron II hydroxide. It begins by discussing the naming conventions, both older and modern, and explains the significance of the 'ous' suffix in determining the oxidation state of iron. The tutorial then covers the oxidation numbers and how to balance charges using the crisscross method to derive the correct chemical formula. Finally, it verifies the formula and concludes with a brief summary.

What is the modern name for ferrous hydroxide?

• Iron I hydroxide

• Iron IV hydroxide

• Iron II hydroxide

• Iron III hydroxide

In the older naming system, what does the suffix 'ous' indicate about the oxidation state?

• The highest oxidation state

• The lowest oxidation state

• A variable oxidation state

• A neutral oxidation state

What is the charge of the hydroxide ion?

• 1+

• 2-

• 1-

• 2+

Why do we need to balance charges when writing the formula for ferrous hydroxide?

• To decrease the compound's density

• To make the compound more reactive

• To ensure the compound is stable

• To increase the compound's solubility

What method is used to write the formula for ferrous hydroxide?

• Balancing method

• Substitution method

• Crisscross method

• Elimination method

How many hydroxide ions are needed to balance the charge of one iron ion in ferrous hydroxide?

• One

• Three

• Four

• Two

What is the final formula for ferrous hydroxide?

• Fe2(OH)3

• Fe(OH)3

• Fe(OH)2

• FeOH

What is the purpose of using parentheses around OH in the formula for ferrous hydroxide?

• To indicate multiple hydroxide ions

• To show the charge of the ion

• To highlight the iron ion

• To separate it from other ions