Review pH, pOH, acid ionization, H+ concentration and OH- concentration. Define a salt chemically. Write an equation to show the products formed when an Arrhenius acid reacts with an Arrhenius base. Indicate that a salt and water is always formed by the double replacement reaction. Use examples or HCl reacting with Mg(OH)2, and HCl reacting with NaOH. Name and write the correct formula for the salt product formed. Define a neutralization reaction in terms of salt and water formation