Net Ionic Equations and Reactions

The video tutorial explains how to write and balance a net ionic equation for the reaction between chromium-3 hydroxide and hydrochloric acid. It begins with balancing the molecular equation, assigning states to each substance, and splitting strong electrolytes into ions. Spectator ions are identified and crossed out, leading to the final balanced net ionic equation. The tutorial emphasizes the importance of charge conservation and atom balance in the process.

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

• Identify spectator ions

• Split strong electrolytes into ions

• Balance the molecular equation

• Determine the states of substances

How many chlorine atoms are needed to balance the molecular equation for the reaction between chromium-3 hydroxide and hydrochloric acid?

• Three

• Two

• One

• Four

Which of the following is generally insoluble in water?

• Ammonium hydroxide

• Chlorides

• Group 1 hydroxides

• Chromium-3 hydroxide

What state is hydrochloric acid in during the reaction?

• Aqueous

• Solid

• Liquid

• Gas

Which substances are not split into ions when writing net ionic equations?

• Aqueous solutions

• Strong acids

• Weak bases

• Solids, liquids, and gases

What are spectator ions?

• Ions that change state during the reaction

• Ions that are only present in the products

• Ions that are the same on both sides of the equation

• Ions that participate in the reaction

What is the net ionic equation for the reaction between chromium-3 hydroxide and hydrochloric acid?

• Cr(OH)3 + 3HCl → CrCl3 + 3H2O

• Cr3+ + 3OH- + 3H+ + 3Cl- → Cr3+ + 3Cl- + 3H2O

• Cr(OH)3 + 3H+ → Cr3+ + 3H2O

• 3HCl → 3H+ + 3Cl-

Why is it important to ensure charge conservation in a net ionic equation?

• To maintain electrical neutrality

• To ensure the reaction is feasible

• To identify spectator ions

• To balance the number of atoms

What is the charge on chromium in the net ionic equation?

• +1

• +2

• 0

• +3

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

• Balancing the molecular equation

• Identifying spectator ions

• Determining the states of substances

• Ensuring charge and atom balance