Cobalt and Phosphate Ion Concepts

The video tutorial explains how to write the formula for cobalt(III) phosphate. It begins by identifying the element symbol for cobalt and its charge, indicated by the Roman numeral III. The tutorial then discusses the phosphate ion, a polyatomic ion with a charge of 3-. The video emphasizes the importance of balancing these charges to form a neutral compound, resulting in the formula CoPO4. The tutorial concludes with a summary of the process and the final formula.

What does the Roman numeral III indicate in the name Cobalt(III) Phosphate?

• The charge on the phosphate ion

• The charge on the cobalt ion

• The number of phosphate ions

• The number of cobalt atoms

Which of the following is a characteristic of a polyatomic ion?

• It consists of a single atom

• It is always neutral

• It is found on the periodic table

• It has a charge and consists of multiple atoms

What is the chemical formula for the phosphate ion?

• PO4^3-

• PO3^2-

• PO4^3+

• PO3^3+

Why must the charges in Cobalt(III) Phosphate add up to zero?

• To form a stable ion

• To ensure the compound is neutral

• To balance the number of atoms

• To match the periodic table

What is the final chemical formula for Cobalt(III) Phosphate?

• Co3(PO4)2

• CoPO4

• Co2(PO4)3

• CoPO3

How do the charges of cobalt and phosphate ions combine in Cobalt(III) Phosphate?

• 1+ from cobalt and 1- from phosphate

• 2+ from cobalt and 2- from phosphate

• 4+ from cobalt and 4- from phosphate

• 3+ from cobalt and 3- from phosphate