Oxidation Numbers and Ions

The video tutorial explains how to determine the oxidation numbers for each element in the ion P2O7 4-. It begins by introducing the concept of oxidation numbers and their significance in ions. The instructor sets up an equation to find the unknown oxidation number of phosphorus, using the known oxidation number of oxygen. The equation is solved to find that the oxidation number of phosphorus is +5. The solution is verified by checking that the sum of oxidation numbers matches the ion's charge. The tutorial concludes with a summary of the process.

What is the total charge of the P2O7 4- ion?

• +4

• +7

• -4

• -7

How many oxygen atoms are present in the P2O7 4- ion?

• 5

• 7

• 4

• 2

What is the typical oxidation number for oxygen in compounds?

• +1

• -2

• -1

• +2

In the equation 2x - 14 = -4, what does 'x' represent?

• The total charge of the ion

• The number of oxygen atoms

• The oxidation number of phosphorus

• The oxidation number of oxygen

What is the oxidation number of phosphorus in the P2O7 4- ion?

• +7

• -5

• +5

• +3

How do you verify the oxidation number of phosphorus in the P2O7 4- ion?

• By dividing the total charge by the number of phosphorus atoms

• By subtracting the oxidation number of oxygen from phosphorus

• By multiplying the oxidation number of oxygen by 2

• By adding the oxidation numbers of phosphorus and oxygen to get -4