Net Ionic Equations and Spectator Ions

The video tutorial explains how to write a balanced net ionic equation for the reaction between ammonium hydroxide and phosphoric acid. It begins with balancing the molecular equation, assigning states to each substance, and then splitting the electrolytes into ions to form the complete ionic equation. The tutorial proceeds to derive the net ionic equation by removing spectator ions and ensuring charge and atom balance. The key takeaway is understanding that phosphoric acid, despite being aqueous, is a weak electrolyte and does not dissociate in the net ionic equation.

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

• Determine the solubility of compounds

• Balance the molecular equation

• Identify spectator ions

• Write the complete ionic equation

Why is phosphoric acid written as a single entity in the net ionic equation?

• It is a weak electrolyte

• It reacts completely with water

• It is a strong acid

• It does not dissolve in water

Which of the following is true about ammonium compounds in aqueous solutions?

• They do not dissociate into ions

• They are very soluble

• They are weak electrolytes

• They are insoluble

What is the charge of the phosphate ion in the reaction?

• 1+

• 2-

• 3-

• 2+

Which ions are considered spectator ions in this reaction?

• Hydroxide ions

• Ammonium ions

• Phosphate ions

• Water molecules

What is the purpose of identifying spectator ions in a reaction?

• To calculate reaction rate

• To determine solubility

• To simplify the net ionic equation

• To balance the equation

How is charge balance achieved in the net ionic equation?

• By adding more reactants

• By changing the state of compounds

• By ensuring equal charges on both sides

• By removing water molecules

What is a key characteristic of phosphoric acid in aqueous solutions?

• It forms a precipitate

• It is a weak electrolyte

• It is a strong electrolyte

• It completely dissociates

Why is it important to recognize weak acids in net ionic equations?

• They increase the reaction rate

• They form strong bonds

• They do not dissociate completely

• They do not affect the reaction

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

• Ensuring charge and atom balance

• Writing the states of compounds

• Identifying spectator ions

• Balancing the molecular equation