Spectator Ions and Ionic Reactions

The video tutorial explains how to write a balanced net ionic equation for the reaction between hydroiodic acid (HI) and magnesium hydroxide (Mg(OH)2). It begins by balancing the molecular equation, then discusses the states of matter and solubility rules for the reactants and products. The tutorial proceeds to form the complete ionic equation by splitting strong electrolytes into ions, and finally derives the net ionic equation by removing spectator ions. The video emphasizes the conservation of charge and mass throughout the process.

What is the first step in balancing the net ionic equation for the reaction between HI and Mg(OH)2?

• Add a coefficient of 2 in front of MgI2

• Add a coefficient of 2 in front of H2O

• Add a coefficient of 2 in front of HI

• Add a coefficient of 2 in front of Mg(OH)2

Which of the following is a strong acid that dissociates completely in water?

• HCl

• H2SO4

• HNO3

• HI

What is the state of magnesium hydroxide in the reaction?

• Solid

• Gas

• Liquid

• Aqueous

In the complete ionic equation, which ions are present from the dissociation of HI?

• H+ and OH-

• Mg2+ and I-

• H+ and I-

• Mg2+ and OH-

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

• It is a strong electrolyte

• It is a solid

• It is a gas

• It is a weak acid

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

• They participate in the reaction

• They change the state of the reaction

• They are catalysts

• They remain unchanged and do not participate

Which ions are considered spectator ions in this reaction?

• I- ions

• OH- ions

• Mg2+ ions

• H+ ions

What is conserved in a balanced net ionic equation?

• Only charge

• Only mass

• Both mass and charge

• Neither mass nor charge

How many hydrogen atoms are present on each side of the balanced net ionic equation?

• Six

• Two

• Eight

• Four

What is the final product of the reaction between HI and Mg(OH)2?

• H2O and I2

• MgI2 and H2O

• HI and Mg(OH)2

• MgO and H2