Net Ionic Equations and Spectator Ions

The video tutorial explains how to write a balanced net ionic equation for the reaction between magnesium oxide (MgO) and hydrochloric acid (HCl). It begins by balancing the molecular equation, then identifies the states of each substance using a solubility table. The tutorial proceeds to write the complete ionic equation by splitting strong electrolytes into ions, while leaving solids and liquids intact. Spectator ions are then removed to derive the net ionic equation. The video concludes by emphasizing the conservation of charge and mass in the balanced equation.

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

• Determine the states of the substances

• Balance the molecular equation

• Identify spectator ions

• Split strong electrolytes into ions

Why is magnesium oxide considered a solid in the reaction?

• It dissolves in water

• It is a strong electrolyte

• It is insoluble in water

• It is a strong acid

What is the state of hydrochloric acid in the reaction?

• Gas

• Aqueous

• Liquid

• Solid

Which ions are present in the complete ionic equation for the reaction?

• Magnesium ions and chloride ions

• Hydrogen ions and water

• Hydrogen ions and chloride ions

• Magnesium ions and water

What is the role of spectator ions in a net ionic equation?

• They form new compounds

• They are removed from the equation

• They change during the reaction

• They participate in the reaction

Which ions are crossed out as spectator ions in this reaction?

• Magnesium ions

• Oxide ions

• Hydrogen ions

• Chloride ions

What must be conserved in a balanced net ionic equation?

• Only mass

• Only charge

• Both mass and charge

• Neither mass nor charge

What is the charge on the magnesium ion in the net ionic equation?

• 1+

• 2-

• 2+

• 1-

How many hydrogen ions are present in the reactants of the net ionic equation?

• One

• Four

• Two

• Three

What is the final product formed in the net ionic equation?

• Magnesium chloride

• Magnesium oxide

• Hydrochloric acid

• Water