Phosphate Ions and Cobalt Compounds

The video tutorial explains how to name the compound Co3(PO4)2. It begins by identifying cobalt as a transition metal and PO4 as a polyatomic ion, specifically phosphate. The tutorial then details the process of determining the charges needed to balance the compound, leading to the name cobalt(II) phosphate. The use of Roman numerals to indicate the charge of the transition metal is also covered.

What type of metal is cobalt in the compound Co3(PO4)2?

• Alkaline earth metal

• Alkali metal

• Noble gas

• Transition metal

What is the polyatomic ion present in Co3(PO4)2?

• Nitrate

• Sulfate

• Carbonate

• Phosphate

Why is it important to know the charge of the phosphate ion when naming Co3(PO4)2?

• To find the melting point

• To calculate the total charge for balance

• To determine the color of the compound

• To identify the state of matter

How many phosphate ions are present in Co3(PO4)2?

• One

• Two

• Three

• Four

What is the total negative charge contributed by the phosphate ions in Co3(PO4)2?

• 9-

• 6-

• 3-

• 12-

What Roman numeral is used to indicate the charge of cobalt in Co3(PO4)2?

• I

• IV

• II

• III

What is the correct name for the compound Co3(PO4)2?

• Cobalt(I) Phosphate

• Cobalt(IV) Phosphate

• Cobalt(II) Phosphate

• Cobalt(III) Phosphate