Ionic Equations and Solubility Concepts

The video tutorial explains how to write and balance the net ionic equation for the reaction between sodium carbonate (Na2CO3) and chromium(II) bromide (CrBr2). It begins with balancing the molecular equation, then discusses the solubility and states of the substances involved. The tutorial proceeds to form the complete ionic equation by splitting strong electrolytes into their ions. Finally, it identifies spectator ions to derive the net ionic equation, ensuring charge and atom balance.

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

• Identify the spectator ions.

• Determine the solubility of the compounds.

• Balance the number of atoms for each element.

• Write the net ionic equation.

Which of the following compounds is generally soluble in water?

• Sodium carbonate

• Chromium carbonate

• Calcium phosphate

• Lead sulfate

What happens to chromium carbonate in the reaction?

• It dissolves in water

• It forms a gas

• It precipitates as a solid

• It remains unchanged

What is the role of a solubility table in writing ionic equations?

• To check the solubility of compounds

• To identify spectator ions

• To determine the charges of ions

• To balance the equation

What is the charge of the carbonate ion?

• 2-

• 2+

• 1-

• 1+

In the complete ionic equation, which ions are not split apart?

• Solid precipitates

• Aqueous ions

• Gaseous products

• Liquid water

What are spectator ions?

• Ions that are insoluble

• Ions that participate in the reaction

• Ions that do not change during the reaction

• Ions that form the precipitate

What is the net charge of a balanced net ionic equation?

• Depends on the reaction

• Negative

• Positive

• Zero

Why is it important to balance the atoms in a chemical equation?

• To increase the reaction rate

• To make the equation look neat

• To conserve mass and charge

• To ensure the reaction is spontaneous

Which ion is typically written first in a net ionic equation?

• Spectator ion

• Neutral molecule

• Positive ion

• Negative ion