Phosphate Ion and Calcium Charge Concepts

The video tutorial explains the charge of the phosphate ion (PO4 3-) and how to determine it using different methods. It discusses using compounds like sodium phosphate and calcium phosphate to deduce the charge and explains the concept of formal charges using a Lewis structure. The tutorial emphasizes that the phosphate ion has a 3- charge, which applies to the entire polyatomic ion, and touches on the concept of resonance.

What is the charge on the phosphate ion?

• 1-

• 2-

• 4-

• 3-

How can we determine the charge of the phosphate ion using sodium phosphate?

• By counting the number of sodium atoms

• By knowing sodium's charge and balancing it with phosphate

• By looking at the color of the compound

• By measuring the mass of the compound

In sodium phosphate, what is the charge of sodium?

• 0

• 2+

• 1+

• 3+

Why does calcium phosphate require two phosphate ions to balance the charge?

• Because phosphate has a 2- charge

• Because phosphate has a 1- charge

• Because calcium has a 2+ charge

• Because calcium has a 1+ charge

What is the charge of calcium in calcium phosphate?

• 0

• 3+

• 2+

• 1+

What is the formal charge on the phosphorus atom in the phosphate ion?

• 1+

• 0

• 1-

• 2+

How many oxygens in the phosphate ion have a formal charge of -1?

• Four

• One

• Three

• Two

What is the significance of resonance in the phosphate ion?

• It increases the ion's mass

• It averages the bond lengths

• It changes the charge of the ion

• It makes the ion unstable

What is the overall ionic charge of the phosphate ion?

• 1-

• 4-

• 3-

• 2-

What does the term 'polyatomic ion' refer to in the context of the phosphate ion?

• An ion with a single atom

• An ion with multiple atoms

• An ion with no charge

• An ion with a positive charge