Balancing Redox Reactions and Oxidation States

This video tutorial focuses on balancing redox reactions using the oxidation number method. It begins with an introduction to redox reactions and the two methods for balancing them: the half-reaction method and the oxidation number method. The video then provides a detailed step-by-step guide on using the oxidation number method, followed by two examples. The first example involves balancing a reaction between permanganate and bromide ions in a basic medium, while the second example balances a reaction between nitric acid and arsenous acid in a neutral medium. The tutorial concludes with a call to action to subscribe to the channel.

What is the primary focus of this lecture on balancing redox reactions?

• Neither method

• Both methods equally

• Half-reaction method

• Oxidation number method

Which step involves determining the oxidation number of each atom in the reaction?

• Step 1

• Step 3

• Step 4

• Step 2

What should be added to balance charges in a reaction occurring in a basic medium?

• Electrons

• Water molecules

• OH- ions

• H+ ions

In the example involving permanganate and bromide ions, what is the change in oxidation number for manganese?

• -6

• +3

• -3

• +6

How many OH- ions are added to balance the charges in the permanganate and bromide reaction?

• 4

• 1

• 2

• 3

In the second example, what is the change in oxidation number for nitrogen?

• +2

• -2

• -3

• +3

How many water molecules are added to balance the oxygen atoms in the nitric acid and arsenous acid reaction?

• Two

• Three

• One

• None

What is the final balanced equation for the reaction between nitric acid and arsenous acid?

• 2HNO3 + 3H3AsO3 → 2NO + 3H3AsO4

• HNO3 + H3AsO3 → NO + H3AsO4

• 2HNO3 + H3AsO3 → NO + 3H3AsO4

• HNO3 + 3H3AsO3 → 2NO + H3AsO4

What is the oxidation state of arsenic in H3AsO4 on the right side of the equation?

• +2

• +4

• +5

• +3

What is the purpose of adding water molecules in the balancing process?

• To balance charges

• To balance electrons

• To balance hydrogen atoms

• To balance oxygen atoms