Phosphate Ions and Magnesium Compounds

The video tutorial explains how to name and write the formula for magnesium phosphate, Mg3(PO4)2. It begins by identifying the components: magnesium, a metal, and the phosphate ion, a polyatomic ion. The tutorial then outlines the steps to name the compound, emphasizing the ionic nature and the need to balance charges. It explains that magnesium has a 2+ charge and phosphate has a 3- charge, requiring three magnesium ions to balance two phosphate ions. The final formula is Mg3(PO4)2, with a net charge of zero.

What is the name of the ion represented by PO4 in the compound Mg3(PO4)2?

• Carbonate ion

• Nitrate ion

• Sulfate ion

• Phosphate ion

Which element is the metal in the compound Mg3(PO4)2?

• Magnesium

• Sulfur

• Oxygen

• Phosphorus

What is the first step in naming the compound Mg3(PO4)2?

• Determine the charge of the ion

• Write the name of the metal

• Count the number of atoms

• Identify the non-metal

What is the charge of the phosphate ion (PO4) in Mg3(PO4)2?

• 2-

• 3-

• 1-

• 4-

How many phosphate ions are present in the formula Mg3(PO4)2?

• Three

• Two

• One

• Four

What is the total positive charge needed to balance the negative charge of two phosphate ions?

• 3+

• 6+

• 4+

• 5+

How many magnesium ions are required to balance the charge of two phosphate ions in Mg3(PO4)2?

• Three

• Two

• Four

• One

What is the final formula for magnesium phosphate?

• Mg(PO4)3

• Mg3(PO4)2

• Mg2(PO4)3

• Mg(PO4)2