Hydrolysis is the reverse of neutralization (a salt reacts with water to produce an acid and a base). The reaction is reversible, so the result depends on the equilibrium. Actual hydrolysis only occurs if a weak acid or base forms, since strong acids and bases release the spectator ions. The reaction occurs because there are a small number of hydronium and hydroxide ions in pure water. The metal ions from the salt can combine with hydroxide ions to form a base, while the nonmetal ions from the salt can combine with hydronium ions to form an acid and water. This PowerPoint presentation describes the hydrolysis reaction and explains the consequences of hydrolysis with respect to salts that are not neutral. Worksheets on this topic are available free of charge on my website at www.evanschemistrycorner.com.