Ionic Compounds and Phosphate Ions

The video tutorial explains how to write the chemical formula for potassium phosphate. It begins by identifying the element symbols for potassium and phosphate, highlighting the importance of recognizing polyatomic ions. The tutorial discusses the ionic charges of potassium and phosphate, emphasizing the need for a neutral compound. The crisscross method is introduced as a technique to balance charges and derive the formula K3PO4. Finally, the tutorial verifies the formula by checking the balance of charges, ensuring the compound is neutral.

What is the chemical symbol for potassium?

• Pt

• P

• K

• Po

What is the formula for the phosphate ion?

• PO2

• P2O5

• PO4

• PO3

What is the ionic charge of the phosphate ion?

• 4-

• 1-

• 3-

• 2-

What is the ionic charge of potassium?

• 0

• 3+

• 2+

• 1+

Why must the charges in a compound add up to zero?

• To make the compound neutral

• To balance the equation

• To ensure the compound is stable

• To increase reactivity

What is the purpose of the crisscross method?

• To calculate the melting point

• To determine the state of matter

• To balance ionic charges

• To find the molecular weight

What is the correct formula for potassium phosphate?

• K2PO4

• KPO4

• K4PO4

• K3PO4