Spectator Ions and Net Ionic Equations

This video tutorial explains how to write a balanced net ionic equation for the reaction between lead(II) chloride (PbCl2) and potassium chromate (K2CrO4). It covers balancing the molecular equation, determining the states of substances using solubility rules, and forming the complete ionic equation by splitting strong electrolytes into ions. The tutorial concludes with deriving the net ionic equation by removing spectator ions and ensuring charge and atom balance.

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

• Write the complete ionic equation

• Identify spectator ions

• Balance the molecular equation

• Determine the solubility of compounds

Why is PbCl2 considered insoluble in net ionic equations?

• It is a liquid

• It is slightly soluble and treated as insoluble

• It is a gas

• It is a strong electrolyte

What state symbol is used for potassium compounds in aqueous solutions?

• (s)

• (l)

• (g)

• (aq)

What is the charge of the chromate ion (CrO4) in the reaction?

• 1+

• 2-

• 0

• 3+

Which ions are not split in the complete ionic equation?

• Aqueous ions

• Solid compounds

• Gaseous compounds

• Liquid compounds

What is the role of spectator ions in a chemical reaction?

• They participate in the reaction

• They change the state of the reaction

• They do not participate in the reaction

• They form a precipitate

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

• Potassium ion

• Chloride ion

• Lead ion

• Chromate ion

What must be conserved in a balanced net ionic equation?

• Only mass

• Neither mass nor charge

• Both mass and charge

• Only charge

What is the final product of the reaction between PbCl2 and K2CrO4?

• PbCl2

• KCl

• K2CrO4

• PbCrO4

What is the significance of balancing atoms in a chemical equation?

• To make the reaction faster

• To maintain the law of conservation of mass

• To change the state of reactants

• To ensure the reaction is endothermic