Net Ionic Equations and Spectator Ions

The video tutorial explains how to balance the net ionic equation for cobalt(III) bromide and potassium sulfide. It starts with balancing the molecular equation, then discusses the solubility of compounds to determine their states. The tutorial proceeds to form the complete ionic equation by splitting strong electrolytes into ions, except for the solid cobalt(III) sulfide. Spectator ions are identified and removed to derive the net ionic equation. The tutorial concludes by ensuring the charges and atoms are balanced in the final equation.

What is the first step in balancing a net ionic equation?

• Determine the states of compounds

• Balance the molecular equation

• Identify the spectator ions

• Split the strong electrolytes into ions

How many bromine atoms are needed to balance the equation for cobalt(III) bromide?

• Two

• Eight

• Four

• Six

Which of the following compounds is generally insoluble?

• Potassium sulfide

• Cobalt(III) bromide

• Cobalt(III) sulfide

• Potassium bromide

What is the state of cobalt(III) sulfide in the reaction?

• Liquid

• Gaseous

• Aqueous

• Solid

What do you do with spectator ions in a net ionic equation?

• Include them in the final equation

• Cross them out

• Convert them to solids

• Balance them separately

Which ions are considered spectator ions in this reaction?

• Potassium ions

• Sulfide ions

• Cobalt ions

• Bromide ions

What is the net charge of the reactants in the balanced net ionic equation?

• 3+

• 0

• 6-

• 6+

What is the net charge of the products in the balanced net ionic equation?

• 3+

• 6-

• 6+

• 0

What is the significance of ensuring charges are balanced in a net ionic equation?

• It helps identify spectator ions

• It ensures the equation is chemically correct

• It determines the solubility of compounds

• It balances the molecular equation

What is the final step in writing a net ionic equation?

• Crossing out spectator ions

• Ensuring charges and atoms are balanced

• Writing the states of compounds

• Balancing the molecular equation