Students practice titration, which compares the volumes of two solutions - one of known concentration and one of unknown concentration - at the point of neutralization, in order to determine the unknown concentration.
Students use a burette filled with a solution of known concentration, and a flask filled with a solution of unknown concentration. They add a small amount of indicator to the flask to visualize the neutralization. They progressively add base from the burette to a flask containing a known volume of acid. At the equivalence point, they measure how much base has been depleted from the burette; this allows them to determine the exact volume of base needed to neutralize the acid.