Spectator Ions and Weak Acids

The video tutorial explains how to write a balanced net ionic equation for the reaction between hydrofluoric acid (HF) and rubidium hydroxide (RBOH). It covers balancing the molecular equation, identifying the states of substances, forming the complete ionic equation, and identifying spectator ions to derive the net ionic equation. The tutorial emphasizes the importance of recognizing HF as a weak acid, which should not be split into ions.

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

• Identify spectator ions

• Balance the molecular equation

• Split all compounds into ions

• Determine the states of substances

Which of the following is true about hydrofluoric acid (HF) in the reaction?

• It completely dissociates in water

• It is a weak acid

• It is a solid

• It is a strong acid

What is the state of rubidium hydroxide (RbOH) in the reaction?

• Solid

• Liquid

• Aqueous

• Gas

When writing the complete ionic equation, which substances are split into ions?

• Only weak acids

• Only solids

• Only strong electrolytes

• All substances

Why is HF not split into ions in the complete ionic equation?

• It is a gas

• It is a solid

• It is a weak acid

• It is a strong acid

What are spectator ions?

• Ions that participate in the reaction

• Ions that do not change during the reaction

• Ions that are only in the products

• Ions that are only in the reactants

Which ion is identified as a spectator ion in this reaction?

• Fluoride ion

• Hydroxide ion

• Hydrogen ion

• Rubidium ion

What must be balanced in a net ionic equation?

• Only the atoms

• Only the charges

• Both atoms and charges

• Neither atoms nor charges

Why is it important to recognize HF as a weak acid in this reaction?

• To ensure it is split into ions

• To avoid splitting it into ions

• To balance the equation

• To treat it as a solid