Cobalt and Hydroxide Ion Concepts

The video tutorial explains how to write the formula for Cobalt 3 Hydroxide. It begins by identifying the element symbol for Cobalt and discusses its charge as a transition metal. The tutorial then introduces hydroxide as a polyatomic ion and explains the need to balance charges in ionic compounds. Finally, it demonstrates how to finalize and verify the formula for Cobalt 3 Hydroxide, ensuring the net charge is zero.

What is the element symbol for Cobalt as found on the periodic table?

• CT

• CL

• CB

• CO

What charge does the Cobalt 3 ion have?

• 4+

• 3+

• 2+

• 1+

What is the charge of the hydroxide ion?

• 1-

• 2-

• 3-

• 0

Why do ionic compounds need to have a net charge of zero?

• To enhance solubility

• To decrease reactivity

• To maintain electrical neutrality

• To increase stability

How many hydroxide ions are needed to balance the charge of one Cobalt 3+ ion?

• 1

• 2

• 3

• 4

Why are parentheses used around the hydroxide ion in the formula for Cobalt 3 hydroxide?

• To indicate the presence of a polyatomic ion

• To show that there are multiple hydroxide ions

• To separate it from the metal

• To highlight its charge