Chemical Compounds and Ions

The video tutorial explains how to write the chemical formula for potassium hydrogen phosphate. It begins by identifying the element symbols for potassium and hydrogen phosphate, highlighting the latter as a polyatomic ion with a 2- charge. The tutorial then discusses the need to balance the ionic charges between potassium, which has a 1+ charge, and hydrogen phosphate. By using two potassium ions, the charges are balanced, resulting in the formula K2HPO4. The video concludes with a summary of the process.

What is the element symbol for potassium?

• Po

• Pt

• K

• P

Which of the following is a polyatomic ion?

• O2

• PO4

• H

• K

What is the charge on the hydrogen phosphate ion?

• 3-

• 0

• 1+

• 2-

Why is it necessary to balance charges in ionic compounds?

• To make the compound more stable

• To ensure the compound is neutral

• To decrease the compound's solubility

• To increase the compound's reactivity

How many potassium ions are needed to balance the charge of one hydrogen phosphate ion?

• Four

• Three

• Two

• One

What is the chemical formula for potassium hydrogen phosphate?

• K2HPO4

• KHPO4

• K2PO4

• K3PO4