Ionic equations

• What is an ionic equation?

  Equation showing oxidation and reduction
• In the reaction between lithium chloride and sodium, sodium displaces lithium.
• Lithium chloride consists of two ions: Li+ and Cl−.
• What is the charge of pure sodium in an ionic equation?

  No charge
• After combining the formulas, the next step is to identify spectator ions.
• Spectator ions are oxidized or reduced during a reaction.

  False
• What happens to the charge of a spectator ion during a reaction?

  Charge does not change
• Steps to write an ionic equation

  1️⃣ Write the formulas for each atom or ion involved

  2️⃣ Combine the reactants and products into one equation

  3️⃣ Identify spectator ions

  4️⃣ Cross out spectator ions from both sides

  5️⃣ Rewrite the final equation
• What is the final ionic equation for the reaction between magnesium oxide and sodium?

  Mg2+ + 2Na → 2Na+ + Mg
• The sulfide ion in the last practice equation is oxidized during the reaction.

  False
• What is the final ionic equation for the reaction between sodium sulfide and potassium?

  2Na+ + 2K → 2K+ + 2Na