Net Ionic Equations and Charge Balance

This video tutorial explains how to write a balanced net ionic equation for the reaction between potassium iodide (KI) and copper(II) sulfate (CuSO4). It covers balancing the molecular equation, determining the states of substances, and splitting strong electrolytes into ions to form the complete ionic equation. The tutorial concludes with deriving the net ionic equation by removing spectator ions, ensuring charge and mass conservation.

What is the purpose of writing a net ionic equation?

• To highlight the formation of precipitates

• To balance the charges in a reaction

• To show all compounds involved in a reaction

• To simplify the reaction by removing spectator ions

Why is it necessary to balance the molecular equation first?

• To identify the limiting reactant

• To ensure the reaction occurs

• To determine the reaction rate

• To conserve mass and charge

Which of the following compounds is insoluble in water?

• Copper(II) sulfate (CuSO4)

• Copper(II) iodide (CuI2)

• Potassium iodide (KI)

• Sodium chloride (NaCl)

What is the charge on the sulfate ion (SO4) in the complete ionic equation?

• 2+

• 2-

• 1-

• 1+

Which ions are considered spectator ions in this reaction?

• Potassium ions (K+)

• Iodide ions (I-)

• Copper ions (Cu2+)

• Sulfate ions (SO4 2-)

What is the net ionic equation for the reaction between KI and CuSO4?

• 2I- + Cu2+ → CuI2

• Cu2+ + 2I- → CuI2

• K+ + SO4 2- → K2SO4

• 2KI + CuSO4 → CuI2 + K2SO4

Why do we not split solids in net ionic equations?

• They do not dissociate in water

• They are not involved in the reaction

• They are already balanced

• They are spectator ions

How do we verify the correctness of a net ionic equation?

• By checking the solubility of products

• By comparing with the molecular equation

• By counting the number of atoms

• By ensuring the charges and mass are balanced

What is the charge balance in the net ionic equation for KI and CuSO4?

• Three positive and three negative charges

• No charges

• One positive and one negative charge

• Two positive and two negative charges

What is conserved in a balanced chemical equation?

• Only charge

• Only mass

• Neither mass nor charge

• Both mass and charge