Bases are substances that accept hydrogen ions (H+) from solutions. They have a pH greater than 7 and can react with acids to form salts and water.
Alkali: A base that is soluble in water.
Hydroxide Ion (OH-): The ion that most bases produce in solution.
Acid-Base Titration: A technique used to determine the concentration of an acid or base by neutralizing it with a solution of known concentration.